| Req ID | Category | Intent | Legal Status | Name | Subdomain(s) | Context | Conditions | Confidence |
|---|---|---|---|---|---|---|---|---|
| #Q001 | operational | health | recommended | ALARA principle for lead | drinking water | Every effort should be made to maintain lead levels in drinking water as low as reasonably achievable (or ALARA). | high | |
| #Q002 | monitoring | unknown | recommended | Target areas for lead monitoring | drinking water | Lead monitoring should focus on areas known or likely to have lead service lines or that have older buildings and should include zones supplied by potentially corrosive water (e.g., dead ends in a chloraminated system) and consecutive systems. | high | |
| #Q003 | corrective_action | operational | recommended | Corrective actions upon MAC exceedance | drinking water | An exceedance of the proposed MAC should be investigated and followed by the appropriate corrective actions. | When the proposed MAC is exceeded | high |
| #Q004 | corrective_action | operational | recommended | Assessment of cause prior to corrective actions | drinking water | However, these actions should be based on an assessment of the cause of the exceedance using appropriate protocols, such as those found in Guidance on Controlling Corrosion in Drinking Water Distribution Systems. | During investigation of an exceedance | high |
| #Q005 | monitoring | unknown | recommended | Compliance monitoring locations | drinking water | Compliance monitoring should be conducted at the consumer’s tap, with priority given to identifying homes with lead service lines, as these are likely to have the highest lead concentrations. | high | |
| #Q006 | monitoring | unknown | recommended | Corrosivity monitoring protocol | drinking water | If the objective is to characterize whether distributed water is corrosive to the materials found in the distribution system and household plumbing, the Guidance on Controlling Corrosion in Drinking Water Distribution Systems should be used. | When assessing water corrosivity | high |
| #Q007 | monitoring | health | recommended | Prioritizing vulnerable facilities | drinking water | Schools and daycare facilities should also be prioritized for monitoring to ensure that the most sensitive population (i.e., young children) is captured. | high | |
| #Q008 | monitoring | unknown | recommended | Minimum monitoring frequency | drinking water | Sampling should be conducted at least once per year, with the number of sites to be monitored determined based on the size of the drinking water system and the type of building, as discussed below. | high | |
| #Q009 | monitoring | unknown | recommended | Year-round sampling | drinking water | Sampling programs should be conducted throughout the year to take into account seasonal effects on lead variability. | high | |
| #Q010 | monitoring | unknown | recommended | Sampling location within residences | drinking water | Sampling should be conducted at the cold water tap in the kitchen or other appropriate location where water is collected for drinking or food preparation. | high | |
| #Q011 | monitoring | unknown | recommended | Sample collection mechanics | drinking water | Regardless of the protocol used, all samples should be collected in wide-mouth sample bottles, and without removing the aerator. | high | |
| #Q012 | monitoring | unknown | mandatory | Sample preservation (residential) | drinking water | The samples need to be acidified using a 2% nitric acid solution and held for a minimum of 16 hours after preservation with nitric acid before analysis. | high | |
| #Q013 | monitoring | unknown | recommended | Sample mixing | drinking water | Each sample should be thoroughly mixed prior to analysis using an appropriate method (see Section 6.0). | high | |
| #Q014 | monitoring | unknown | recommended | Minimum sample size for RDT | drinking water | It is recommended that total lead be monitored, at least once per year, at the tap of a minimum of 20 randomly selected residences in each water supply zone. | high | |
| #Q015 | monitoring | unknown | recommended | RDT sample volume | drinking water | A 1 L sample should be collected randomly during the day from a drinking water tap in each of the residences. | When using RDT sampling | high |
| #Q016 | monitoring | unknown | recommended | RDT sampling conditions | drinking water | Samples should be collected without prior flushing; no stagnation period is prescribed, to better reflect consumer use. | When using RDT sampling | high |
| #Q017 | monitoring | unknown | recommended | 30MS sampling preparation | drinking water | The tap should be flushed for 5 minutes, allowed to stand for a 30-minute stagnation period, during which time no water should be drawn from any outlet within the residence (including flushing of toilets). | When using 30MS sampling | high |
| #Q018 | monitoring | unknown | recommended | 30MS sample collection | drinking water | Two 1 L samples should then be collected at a medium to high flow rate (greater than 5 L/minute). | When using 30MS sampling | high |
| #Q019 | monitoring | health | recommended | Monitoring locations in schools and daycares | drinking water | In schools and daycares, it is recommended that total lead be monitored, at least once per year, at each of the drinking water fountains or cold water taps where water is used for drinking or food preparation. | high | |
| #Q020 | monitoring | unknown | recommended | Timing of sampling in schools and large buildings | drinking water | Sampling should be conducted between the months of June and October, but when the buildings are fully occupied and functional, to capture typical exposure levels – recommended to be in either June or October for schools. | high | |
| #Q021 | monitoring | health | recommended | Monitoring locations in large buildings | drinking water | In multi-dwelling (i.e., more than six residences) buildings or large buildings, it is recommended that total lead be monitored, at least once per year, at each of the drinking water fountains and at a proportion of cold water taps where water is used for drinking or food preparation. | high | |
| #Q022 | monitoring | unknown | recommended | Prioritizing sites in multi-dwelling buildings | drinking water | When sampling multi-dwelling buildings, priority should be given to sites suspected or known to have full or partial lead service lines. | high | |
| #Q023 | monitoring | unknown | recommended | RDT sampling protocol in multi-dwelling buildings | drinking water | A RDT sampling protocol is recommended for these sites to capture typical exposures, including potential exposure to particulate lead. | In multi-dwelling buildings | high |
| #Q024 | monitoring | unknown | recommended | RDT sampling methodology for schools and large buildings | drinking water | RDT sampling should be conducted by collecting a sample at drinking water fountains or at cold water taps where water is used for drinking or food preparation, without a stagnation period and without prior flushing. | high | |
| #Q025 | monitoring | unknown | recommended | RDT sample collection details in schools/buildings | drinking water | Two 125 mL samples should be collected, preferably in wide-mouth sample bottles, at a medium to high flow rate without removing the aerator. | high | |
| #Q026 | monitoring | unknown | mandatory | Sample preservation (schools/buildings) | drinking water | The samples need to be held for a minimum of 16 hours after they are acidified using a 2% nitric acid solution and prior to analysis. | high | |
| #Q027 | monitoring | unknown | recommended | Sample mixing (schools/buildings) | drinking water | Each sample should be thoroughly mixed prior to being analyzed using an appropriate method (see Section 6.0). | high | |
| #Q028 | monitoring | health | mandatory | Sampling plan design considering vulnerable occupants | drinking water | The sampling plan for schools and child care centres/facilities must consider that many occupants in these buildings are the most susceptible to the adverse health effects from lead exposure. | high | |
| #Q029 | monitoring | unknown | recommended | Prioritizing outlets in schools and daycares | drinking water | Consequently, sampling plans for these facilities should prioritize every drinking water fountain and cold water outlet used for drinking or food preparation over infrequently used outlets. | high | |
| #Q030 | monitoring | unknown | recommended | Sampling plans in other building types | drinking water | In other building types, sampling plans should also target drinking water fountains and cold water outlets used for drinking or food preparation, but with the number of sites sampled based on the size and population of the building. | high | |
| #Q031 | monitoring | unknown | recommended | Acidification level or heated digestion | drinking water | Since the use of 0.15% nitric acid for preservation does not adequately capture particulate lead, it is recommended that 2% nitric acid be used for the preservation step or that heated digestion, as outlined in EPA Method 200.8, be used when analyzing lead in drinking water samples. | high | |
| #Q032 | monitoring | unknown | recommended | Qualified personnel for 2% nitric acid addition | drinking water | It is important to note that the addition of 2% nitric acid should be undertaken by qualified personnel and using appropriate precautions. | high | |
| #Q033 | monitoring | unknown | recommended | Acidification limitation for homeowners | drinking water | To this end, if sampling is conducted by homeowners, the sample should only be acidified and held upon arrival at the laboratory. | If sampling is conducted by homeowners | high |
| #Q034 | operational | health | recommended | Encourage full service line replacement | drinking water | Generally, utilities should encourage consumers to replace their portion of the lead service line to minimize exposure to lead | high | |
| #Q035 | corrective_action | operational | recommended | Flushing and cleaning after service line replacement | drinking water | Corrosion control measures that include partial or full replacement of the lead service line should ensure that appropriate flushing is conducted after the replacement and that debris is subsequently cleaned from the screens or aerators of outlets | After partial or full lead service line replacement | high |
| #Q036 | corrective_action | operational | recommended | Initial flushing and post-replacement sampling | drinking water | Extensive initial flushing by the consumer should be encouraged, and weekly or biweekly sampling should be conducted until lead levels stabilize. | Following service line replacement | high |
| #Q037 | monitoring | unknown | recommended | Extended tap monitoring after replacement | drinking water | The water quality at the consumer’s tap should be monitored closely following both full and partial lead service line replacement for several months after replacement. | Following service line replacement | high |
| #Q038 | administrative | operational | recommended | Communication regarding aerator maintenance | drinking water | The importance of regularly cleaning outlet aerators should be communicated to consumers to ensure that any lead-containing particles are removed as part of ongoing maintenance | high | |
| #Q039 | monitoring | unknown | recommended | Timing for routine sampling | drinking water | routine sampling should be conducted during the same period every year from June to October, especially for monitoring of homes with lead service lines, as levels of lead are expected to be highest in those months | high | |
| #Q040 | corrective_action | operational | recommended | Response to red water episodes | drinking water | As discoloration (red water) episodes can be accompanied by the release of accumulated contaminants, including lead, they should trigger maintenance actions, such as systematic unidirectional flushing of the distribution system, to ensure that all particles are flushed out before the water reaches the consumer | During red water episodes | high |
| #Q041 | monitoring | unknown | recommended | Testing before treatment device installation | drinking water | Before a treatment device is installed, the water should be tested to determine general water chemistry and to verify the concentration of lead. | Prior to point-of-use or point-of-entry device installation | high |
| #Q042 | monitoring | unknown | recommended | Periodic verification testing of treatment devices | drinking water | Periodic testing by an accredited laboratory should be conducted on both the water entering the treatment device and the finished water to verify that the treatment device is effective. | high | |
| #Q043 | operational | unknown | recommended | Treatment device maintenance | drinking water | Consumers should verify the expected longevity of the adsorption media in their treatment device as per the manufacturer’s recommendations and service the device when required. | high | |
| #Q044 | treatment | health | recommended | Recommendation for certified treatment devices | drinking water | Health Canada does not recommend specific brands of drinking water treatment devices, but it strongly recommends that consumers use devices that have been certified by an accredited certification body as meeting the appropriate NSF/ANSI drinking water treatment unit standard(s). | high | |
| #Q045 | monitoring | unknown | guidance | Reduction of monitoring frequency in schools and daycares | drinking water | Jurisdictions may choose to reduce monitoring if they have established that the lead issues have been identified and addressed. | If lead issues have been identified and addressed | high |
| #Q046 | monitoring | unknown | recommended | Metals sampling during red water episodes | drinking water | Therefore, such events [discoloration (red water) episodes] should not be considered only as an aesthetic issue, but should trigger sampling for metals and potentially additional distribution system maintenance. | During discoloration (red water) episodes | high |
| #Q047 | monitoring | unknown | guidance | Laboratory best practices for total lead estimation | drinking water | Best practices leading to a better estimation of total lead include ensuring that no aliquot or volume transfers occur prior to preservation or analysis, in situ sample preservation where feasible, maintaining a minimum holding time of 16 hours after preservation, thoroughly mixing the sample prior to analysis and taking the aliquot directly from the original sample bottle. | During laboratory sample preparation | high |
| #Q048 | treatment | operational | mandatory | RO product water pH adjustment | drinking water | Therefore, the product water pH must be adjusted to avoid corrosion issues in the distribution system such as the leaching of lead and copper | Following treatment by a reverse osmosis system | high |
| #Q049 | treatment | operational | mandatory | Anion exchange pH adjustment | drinking water | Raising the pH of the treated water may be required at the beginning of a run (100–400 BVs) to avoid corrosion | During the initial 100-400 bed volumes of an anion exchange run | high |
| #Q050 | monitoring | unknown | mandatory | Sampling protocol selection criteria | drinking water | Monitoring of lead at the tap can be done using different sampling protocols, but the selected protocol must take into consideration the desired objective. | high | |
| #Q051 | treatment | operational | recommended | Permanence of residential treatment devices | drinking water | However, the use of such devices should not be considered to be a permanent solution. | Regarding the use of residential drinking water treatment devices for lead | high |
| Req ID | Category | Intent | Legal Status | Name | Subdomain(s) | Limit Type | Limit Value | Context | Conditions | Confidence |
|---|---|---|---|---|---|---|---|---|---|---|
| #P001 | chemical | health | recommended | Proposed MAC for total lead in drinking water | drinking water | MAC | 0.005 mg/L | A maximum acceptable concentration (MAC) of 0.005 mg/L (5 µg/L) is proposed for total lead in drinking water, based on a sample of water taken at the tap. | Based on a sample of water taken at the tap and using the appropriate protocol for the type of building being sampled. | high |
| #P002 | design | health | mandatory | Lead content limit for pipes and fittings | drinking water | requirement | <= 0.25 % | legislation limiting the weighted average lead content of pipes, pipe fittings and plumbing fittings to 0.25% | Weighted average | high |
| #P003 | chemical | health | mandatory | Leachable lead limit for kettles | drinking water | requirement | <= 0.010 mg/L | The Hazardous Products (Kettles) Regulations limit the amount of lead that may be released when water is boiled, in kettles or similar products, to 0.010 mg/L. | When water is boiled in kettles or similar products | high |
| #P004 | operational | treatment | mandatory | NSF/ANSI Standard 53 Effluent Lead Concentration | drinking water | requirement | < 10 µg/L | the device must be capable of reducing an influent lead concentration of 150 µg/L to a maximum final (effluent) lead concentration of less than 10 µg/L | For a drinking water treatment device to be certified to NSF/ANSI Standard 53 | high |
| #P005 | design | health | mandatory | NSF/ANSI Standard 61 Single Product Allowable Concentration | drinking water | requirement | <= 5 µg/L | When materials are certified to the standard, the concentration of lead must not exceed the single product allowable concentration of 5 µg/L | For materials certified to NSF/ANSI Standard 61 | high |
| #P006 | chemical | health | mandatory | Lead limit for toys and children's products | other | requirement | 90 mg/kg | The lead content of applied surface coatings on toys, jewellery, furniture and other products intended for children was restricted to 90 mg/kg total lead. | As of November 2010 | high |
| #P007 | chemical | health | mandatory | Lead limit for children's jewellery | other | requirement | 600 mg/kg | The lead content of all jewellery items intended for children under 15 years of age is limited to 600 mg/kg total lead. | For children under 15 years of age | high |
| #P008 | chemical | health | guideline | CCME soil quality guideline for human health | other | requirement | 140 mg/kg | most samples contained lead at concentrations below the current Canadian Council of Ministers of the Environment (CCME) soil quality guideline for human health (140 mg/kg). | Residential and parkland soils | high |
| #P009 | operational | operational | recommended | Acidification strength for lead sample preservation | drinking water | requirement | 2 % | The samples need to be acidified using a 2% nitric acid solution and held for a minimum of 16 hours. | Nitric acid solution | high |
| #P010 | operational | operational | recommended | Minimum flow rate for lead sampling | drinking water | requirement | > 5 L/minute | Two 1 L samples should then be collected at a medium to high flow rate (greater than 5 L/minute). | 30MS sampling protocol | high |
| #P011 | operational | reporting | recommended | Minimum residential samples per water supply zone | drinking water | requirement | 20 residences | It is recommended that total lead be monitored, at least once per year, at the tap of a minimum of 20 randomly selected residences in each water supply zone. | Per water supply zone | high |
| #P012 | operational | reporting | recommended | Maximum population per water supply zone | drinking water | requirement | <= 50000 residents | Monitoring programs are conducted within defined water supply zones, which can vary in size but generally should not exceed 50,000 residents each. | Geographical areas with uniform water quality | high |
| #P013 | operational | reporting | mandatory | Monitoring frequency for lead at the tap | drinking water | requirement | >= 1 times/year | Sampling should be conducted at least once per year, with the number of sites to be monitored determined based on the size of the drinking water system. | At the consumer's tap | high |
| #P014 | operational | operational | guideline | Practical quantitation limit (PQL) for lead | drinking water | OG | 0.005 mg/L | The practical quantitation limit (PQL) for the U.S. EPA-approved methods is 0.005 mg/L (5 µg/L). | Based on capability of laboratories using approved methods | high |
| #P015 | chemical | health | mandatory | Existing MAC for lead in drinking water (1992) | drinking water | MAC | 0.01 mg/L | The existing guideline for lead, last updated in 1992, based its maximum acceptable concentration (MAC) of 0.01 mg/L (10 µg/L). | Historical regulatory status | high |
| #P016 | operational | operational | mandatory | Stagnation period for 30MS sampling protocol | drinking water | requirement | 30 minutes | The tap should be flushed for 5 minutes, allowed to stand for a 30-minute stagnation period. | During which time no water should be drawn from any outlet. | high |
| #P017 | operational | operational | mandatory | Initial flushing time for 30MS sampling protocol | drinking water | requirement | 5 minutes | The tap should be flushed for 5 minutes, allowed to stand for a 30-minute stagnation period. | Prior to 30 minute stagnation. | high |
| #P018 | operational | operational | mandatory | Sample volume for residential lead sampling | drinking water | requirement | 1 L | A 1 L sample should be collected randomly during the day... Two 1 L samples should then be collected. | Applicable to both RDT and 30MS protocols. | high |
| #P019 | operational | operational | mandatory | Sample volume for schools and large building sampling | drinking water | requirement | 125 mL | Two 125 mL samples should be collected, preferably in wide-mouth sample bottles. | RDT sampling at drinking water fountains or cold water taps. | high |
| #P020 | operational | operational | mandatory | Minimum acidification holding period | drinking water | requirement | >= 16 hours | The samples need to be held for a minimum of 16 hours after they are acidified using a 2% nitric acid solution. | Prior to analysis. | high |
| #P021 | chemical | health | mandatory | Migratable lead limit for children's jewellery | other | requirement | 90 mg/kg | The lead content of all jewellery items intended for children under 15 years of age is limited to 600 mg/kg total lead and 90 mg/kg migratable lead. | For children under 15 years of age. | high |
| #P022 | operational | reporting | guidance | Multi-dwelling residence classification threshold | drinking water | requirement | > 6 residences | In multi-dwelling (i.e., more than six residences) buildings or large buildings... | Classification for monitoring protocols. | high |
| #P023 | operational | treatment | mandatory | NSF/ANSI Standard 53 Challenge Influent Lead Concentration | drinking water | requirement | 150 µg/L | the device must be capable of reducing an influent lead concentration of 150 µg/L to a maximum final (effluent) lead concentration of less than 10 µg/L. | For certification to NSF/ANSI Standard 53. | high |
| #P024 | physical | operational | guidance | Sample turbidity threshold for hot digestion | drinking water | requirement | > 1 NTU | addition of hydrochloric acid for hot digestion when the sample turbidity is above 1 nephelometric turbidity unit (NTU) | when particulate lead is present or suspected | high |
| #P025 | chemical | operational | guideline | Standard nitric acid preservation concentration | drinking water | requirement | 0.15 % | standard acid preservation (0.15% nitric acid) | pH < 2 | high |
| #P026 | chemical | health | guidance | Cancer risk derived concentration | drinking water | treatment_goal | 7 µg/L | excess lifetime cancer risk of 10−6 was used to derive a concentration of 7 µg/L | lifetime human cancer risk | high |
| #P027 | chemical | health | guidance | Non-cancer neurodevelopmental risk derived concentration | drinking water | treatment_goal | 0.008 - 0.08 µg/L | acceptable level of risk ranging from 10−4 to 10−5... correspond to concentrations ranging from 0.008 to 0.08 µg/L | for children aged 5–11 years, identified as the most sensitive population | high |
| #P028 | operational | reporting | mandatory | Newfoundland monitoring frequency (population > 5,000) | drinking water | requirement | 4 times/year | Lead monitoring is conducted semi-annually for all public water supplies in the province, and quarterly for populations larger than 5,000. | Populations larger than 5,000 in Newfoundland and Labrador | high |
| #P029 | operational | reporting | mandatory | Newfoundland monitoring frequency (general) | drinking water | requirement | 2 times/year | Lead monitoring is conducted semi-annually for all public water supplies in the province. | General public water supplies in Newfoundland and Labrador | high |
| #P030 | chemical | health | mandatory | Historical Lead Surface Coating Limit (1976-2005) | other | requirement | 5000 mg/kg | applied surface coatings on older products sold... between 1976 and 2005 may have contained up to 5000 mg/kg lead. | Products sold between 1976 and 2005 | high |
| #P031 | chemical | health | mandatory | Historical Lead Surface Coating Limit (2005-2010) | other | requirement | 600 mg/kg | applied surface coatings on older products sold between 2005 and 2010 may have contained up to 600 mg/kg total lead. | Products sold between 2005 and 2010 | high |
| #P032 | operational | operational | recommended | School and Daycare Monitoring Window | drinking water | requirement | June - October months | Sampling should be conducted between the months of June and October... recommended to be in either June or October for schools. | When buildings are fully occupied and functional | high |
| #P033 | chemical | reporting | mandatory | Method 200.8 Method Detection Limit | drinking water | requirement | 0.02 - 0.6 µg/L | Method 200.8 Rev. 5.4 (U.S. EPA, 2009a) uses ICP-MS and has MDL values ranging from 0.02 to 0.6 µg/L. | Analysis of total lead using ICP-MS | high |
| #P034 | chemical | reporting | mandatory | Method 200.9 Method Detection Limit | drinking water | requirement | 0.7 µg/L | Method 200.9 Rev. 2.2 (U.S. EPA, 2009a) uses stabilized temperature platform GFAAS and has an MDL of 0.7 µg/L. | Analysis of total lead using GFAAS | high |
| #P035 | chemical | reporting | mandatory | Standard Method 3113B Method Detection Limit | drinking water | requirement | 1 µg/L | SM 3113B has also been approved for the analysis of lead using GFAAS and has an MDL of 1 µg/L | Analysis using GFAAS | high |
| #P036 | chemical | reporting | mandatory | Palintest Method 1001 Method Detection Limit | drinking water | requirement | 2 µg/L | An MDL of 2 µg/L was established for lead during U.S. EPA validation testing done by three laboratories | Differential pulse anodic stripping voltammetry | high |
| #P037 | operational | operational | guidance | RDT to 30MS Sample Count Ratio | drinking water | requirement | 2 - 5 times | Due to its random nature, RDT sampling requires 2-5 times more samples than 30MS to be statistically robust. | When using RDT as an alternative to 30MS for identifying priority areas | high |
| Req ID | Category | Name | Context | Confidence |
|---|---|---|---|---|
| #D001 | water supply zones | geographical areas within which the quality of drinking water is considered approximately uniform | high | |
| #D002 | 30MS | 30 minutes stagnation time | high | |
| #D003 | ACSL | Advanced Continuous Simulation Language | high | |
| #D004 | ADHD | attention deficit hyperactivity disorder | high | |
| #D005 | ALAD | γ-aminolevulinic acid dehydratase | high | |
| #D006 | ALARA | as low as reasonably achievable | high | |
| #D007 | ANSI | American National Standards Institute | high | |
| #D008 | APP | amyloid precursor protein | high | |
| #D009 | ASCII | American Standard Code for Information Interchange | high | |
| #D010 | ASME | American Society of Mechanical Engineers | high | |
| #D011 | ASV | anodic stripping voltammetry | high | |
| #D012 | BLL | blood lead level | high | |
| #D013 | BMD | benchmark dose | high | |
| #D014 | BMD 01 | benchmark dose associated with a 1% change in response | high | |
| #D015 | BMD 10 | benchmark dose associated with a 10% change in response | high | |
| #D016 | BMDL 01 | 95% lower confidence limit on the BMD 01 | high | |
| #D017 | BMDL 10 | 95% lower confidence limit on the BMD 10 | high | |
| #D018 | bw | body weight | high | |
| #D019 | CCME | Canadian Council of Ministers of the Environment | high | |
| #D020 | CCPSA | Canada Consumer Product Safety Act | high | |
| #D021 | CI | confidence interval | high | |
| #D022 | CPSC | Consumer Product Safety Commission (U.S.) | high | |
| #D023 | CSA | Canadian Standards Association | high | |
| #D024 | CSMR | chloride to sulphate mass ratio | high | |
| #D025 | DNA | deoxyribonucleic acid | high | |
| #D026 | DOS | Disk Operating System | high | |
| #D027 | EFSA | European Food Safety Authority | high | |
| #D028 | EPA | Environmental Protection Agency (U.S.) | high | |
| #D029 | FAO | Food and Agriculture Organization of the United Nations | high | |
| #D030 | FF | fully flushed | high | |
| #D031 | FORTRAN | Formula Translating System (now known as Fortran) | high | |
| #D032 | GC-MS | gas chromatography/mass spectrometry | high | |
| #D033 | GFAAS | graphite furnace atomic absorption spectroscopy | high | |
| #D034 | HBV | health-based value | high | |
| #D035 | HOME | Home Observation for Measurement of the Environment | high | |
| #D036 | IARC | International Agency for Research on Cancer | high | |
| #D037 | IEUBK | Integrated Exposure Uptake Biokinetic Model for Lead in Children | high | |
| #D038 | ICP | inductively coupled plasma | high | |
| #D039 | IQ | intelligence quotient | high | |
| #D040 | JECFA | Joint FAO/WHO Expert Committee on Food Additives | high | |
| #D041 | LTP | long-term potentiation | high | |
| #D042 | MAC | maximum acceptable concentration | high | |
| #D043 | MDL | method detection limit | high | |
| #D044 | MMSE | mini-mental status exam | high | |
| #D045 | MS | mass spectrometry | high | |
| #D046 | NCRMP | National Chemical Residue Monitoring Program | high | |
| #D047 | NHANES | National Health and Nutrition Examination Survey (U.S.) | high | |
| #D048 | NPC | National Plumbing Code of Canada | high | |
| #D049 | NPRI | National Pollutant Release Inventory | high | |
| #D050 | NSF | NSF International | high | |
| #D051 | NTU | nephelometric turbidity unit | high | |
| #D052 | OMOE | Ontario Ministry of the Environment | high | |
| #D053 | OR | odds ratio | high | |
| #D054 | Pb | lead | high | |
| #D055 | PBPK | physiologically based pharmacokinetic | high | |
| #D056 | PM 2.5 | particulate matter having an aerodynamic diameter of less than 2.5 μm | high | |
| #D057 | POE | point of entry | high | |
| #D058 | POU | point of use | high | |
| #D059 | PQL | practical quantitation limit | high | |
| #D060 | PTWI | provisional tolerable weekly intake | high | |
| #D061 | RDT | random daytime | high | |
| #D062 | RO | reverse osmosis | high | |
| #D063 | RR | relative risk | high | |
| #D064 | SCC | Standards Council of Canada | high | |
| #D065 | SM | Standard Method | high | |
| #D066 | Sp1 | specificity protein 1 | high | |
| #D067 | WHO | World Health Organization | high | |
| #D068 | BVs | bed volumes | high | |
| #D069 | CDW | Federal-Provincial-Territorial Committee on Drinking Water | high | |
| #D070 | ICP-MS | inductively coupled plasma–mass spectrometry | high | |
| #D071 | WQA | Water Quality Association | high | |
| #D072 | BNQ | Bureau de normalisation du Québec | high | |
| #D073 | IAPMO | International Association of Plumbing & Mechanical Officials | high | |
| #D074 | allometric scaling factor | factor used to account for toxicokinetic differences between mice and humans | high | |
| #D075 | WSA | Water Security Agency | high | |
| #D076 | LPDWS | large public drinking water systems | high | |
| #D077 | Lead | a dense, odourless, bluish-grey, lustrous metal that is malleable, insoluble and resistant to chemical corrosion | high | |
| #D078 | LSLs | lead service lines | high | |
| #D079 | multi-dwelling | more than six residences | high | |
| #D080 | NAPS | National Air Pollution Surveillance program | high | |
| #D081 | blood lead index | time-weighted average BLL corresponding to total exposure | high | |
| #D082 | concurrent BLL | BLL closest to testing | high | |
| #D083 | early-childhood BLL | mean BLL from 6 months to 2 years of age | high | |
| #D084 | creatinine clearance | estimated from creatinine in serum and in urine collected over 24 hours | high | |
| #D085 | mild mental retardation | an IQ of less than 70 | high | |
| #D086 | gifted children | children with an IQ of more than 130 | high | |
| #D087 | full replacement of a lead service line | utility and homeowner portions of a lead service line replacement | high | |
| #D088 | partial lead service line replacement | replacing only the utility or consumer's portion of a lead service line | high | |
| #D089 | red water | discoloration episodes | high | |
| #D090 | composite proportional sampling | sampling achieved with a consumer-operated device fitted to the drinking water tap that splits off a small, constant proportion of every volume of water drawn, typically over a period of 1 week | high | |
| #D091 | NRCC | National Research Council of Canada | high |