| #D001 | | primary drinking water regulation | a regulation which- (A) applies to public water systems; (B) specifies contaminants which, in the judgment of the Administrator, may have any adverse effect on the health of persons; (C) specifies for each such contaminant either- (i) a maximum contaminant level, if, in the judgment of the Administrator, it is economically and technologically feasible to ascertain the level of such contaminant in water in public water systems, or (ii) if, in the judgment of the Administrator, it is not economically or technologically feasible to so ascertain the level of such contaminant, each treatment technique known to the Administrator which leads to a reduction in the level of such contaminant sufficient to satisfy the requirements of section 300g–1 of this title; and (D) contains criteria and procedures to assure a supply of drinking water which dependably complies with such maximum contaminant levels; including accepted methods for quality control and testing procedures to insure compliance with such levels and to insure proper operation and maintenance of the system, and requirements as to (i) the minimum quality of water which may be taken into the system and (ii) siting for new facilities for public water systems. At any time after promulgation of a regulation referred to in this paragraph, the Administrator may add equally effective quality control and testing procedures by guidance published in the Federal Register. Such procedures shall be treated as an alternative for public water systems to the quality control and testing procedures listed in the regulation. | high |
| #D002 | | secondary drinking water regulation | a regulation which applies to public water systems and which specifies the maximum contaminant levels which, in the judgment of the Administrator, are requisite to protect the public welfare. Such regulations may apply to any contaminant in drinking water (A) which may adversely affect the odor or appearance of such water and consequently may cause a substantial number of the persons served by the public water system providing such water to discontinue its use, or (B) which may otherwise adversely affect the public welfare. Such regulations may vary according to geographic and other circumstances. | high |
| #D003 | | maximum contaminant level | the maximum permissible level of a contaminant in water which is delivered to any user of a public water system. | high |
| #D004 | | public water system | a system for the provision to the public of water for human consumption through pipes or other constructed conveyances, if such system has at least fifteen service connections or regularly serves at least twenty-five individuals. Such term includes (i) any collection, treatment, storage, and distribution facilities under control of the operator of such system and used primarily in connection with such system, and (ii) any collection or pretreatment storage facilities not under such control which are used primarily in connection with such system. | high |
| #D005 | | supplier of water | any person who owns or operates a public water system. | high |
| #D006 | | contaminant | any physical, chemical, biological, or radiological substance or matter in water. | high |
| #D007 | | Administrator | the Administrator of the Environmental Protection Agency. | high |
| #D008 | | Agency | the Environmental Protection Agency. | high |
| #D009 | | Council | the National Drinking Water Advisory Council established under section 300j–5 of this title. | high |
| #D010 | | municipality | a city, town, or other public body created by or pursuant to State law, or an Indian Tribe. | high |
| #D011 | | Federal agency | any department, agency, or instrumentality of the United States. | high |
| #D012 | | person | an individual, corporation, company, association, partnership, State, municipality, or Federal agency (and includes officers, employees, and agents of any corporation, company, association, State, municipality, or Federal agency). | high |
| #D013 | | State | Except as provided in subparagraph (B), the term "State" includes, in addition to the several States, only the District of Columbia, Guam, the Commonwealth of Puerto Rico, the Northern Mariana Islands, the Virgin Islands, American Samoa, and the Trust Territory of the Pacific Islands. (B) For purposes of section 300j–12 of this title, the term "State" means each of the 50 States, the District of Columbia, and the Commonwealth of Puerto Rico. | high |
| #D014 | | Indian Tribe | any Indian tribe having a Federally recognized governing body carrying out substantial governmental duties and powers over any area. For purposes of sections 300j–12, 300j–19a, and 300j–19b of this title, the term includes any Native village (as defined in section 1602(c) of title 43). | high |
| #D015 | | community water system | a public water system that- (A) serves at least 15 service connections used by year-round residents of the area served by the system; or (B) regularly serves at least 25 year-round residents. | high |
| #D016 | | noncommunity water system | a public water system that is not a community water system. | high |
| #D017 | | residential uses | drinking, bathing, and cooking, or other similar uses | high |