Title 42 › CHAPTER 6A — PUBLIC HEALTH SERVICE › SUBCHAPTER XII — SAFETY OF PUBLIC WATER SYSTEMS › Part B — Public Water Systems › § 300g–4
Lets states or the EPA allow a public water system to have a temporary exception to a drinking water rule when the system truly can’t meet a contaminant limit because of the raw water it uses. If a State has primary enforcement, it can give a variance when the system proves alternative water is not available and must install the best technology the EPA finds is available (EPA’s findings may differ by system size and cost). The State must find the variance won’t cause an unreasonable health risk, set a public notice and hearing, and give the system a schedule for meeting the rule and for extra controls. The State must tell EPA why it granted the variance and keep schedules enforceable. EPA will review variances (first review within 18 months after the interim rules take effect, then at least every 3 years), publish notices and results, and can notify a State if it finds widespread misuse. If EPA objects, it will identify affected systems, propose revocations or new schedules, hold a hearing and finish action within 180 days; revocations or new schedules cannot take effect until at least 90 days after the notice. If a State lacks primary enforcement, EPA has the same power the State would have. Smaller systems can get special variances: systems serving 3,300 or fewer people (and, with EPA approval, those serving more than 3,300 but under 10,000) may get a variance if EPA has identified a suitable variance technology, the system installs and maintains it, and the State finds the system cannot afford full compliance under affordability rules. These variances must require compliance within 3 years (with up to 2 more years if needed), must be reviewed at least every 5 years after the compliance date, and do not apply to rules made before January 1, 1986 or to microbial contaminant rules. EPA must write rules for these small-system variances within 2 years after August 6, 1996, and publish affordability guidance within 18 months after August 6, 1996. EPA may also approve alternative treatment techniques shown to be at least as effective as required techniques. States must submit proposed variances for systems serving more than 3,300 and fewer than 10,000 people to EPA for approval within 90 days, EPA may object within 90 days of a proposal, and any consumer may petition EPA to object within 30 days (EPA will respond within 60 days).
Full Legal Text
The Public Health and Welfare, Source: USLM XML via OLRC
Legislative History
Reference
Citation
42 U.S.C. § 300g–4
Title 42, The Public Health and Welfare
Last Updated
Sep 23, 2026
Release point: 119-110