✖ Compliance tracking

Drinking Water Violations Map

Every year, tens of millions of Americans receive water from systems that violated federal safety standards. This map tracks health-based violations of the Safe Drinking Water Act — from MCL exceedances to treatment failures and monitoring gaps.

223,657

Health-based violations in database

286,768

Currently unresolved violations

1,974,588

Total violations on record

50K+

Public water systems tracked by EPA

WorstBest No data

Violation subscore (0 = worst compliance record, 40 = best)

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~70 million Americans receive water from systems that violated at least one federal health standard in a recent year, according to NRDC analysis of EPA SDWIS data. Rural and low-income communities are disproportionately affected — small systems serving fewer than 500 people account for the majority of violations.

The enforcement gap: key facts

90+

Contaminants with enforceable Maximum Contaminant Levels under the Safe Drinking Water Act

50,000+

Public water systems tracked by the EPA's SDWIS database, serving populations from dozens to millions

~70M

Americans who received water from a system with at least one federal health violation in a recent year (NRDC)

$25K/day

Maximum EPA penalty per SDWA violation — rarely imposed; many systems remain in violation for years without significant enforcement

24 hours

Required notification to customers following an acute health-based violation (E. coli, nitrate, etc.)

C−

Grade given to US drinking water infrastructure by the American Society of Civil Engineers in 2021 — estimated $473B needed over 20 years

States with worst violation records

Ranked by average violation subscore across all water systems. The score (0–40) accounts for the frequency, severity, and resolution status of health-based violations from EPA SDWIS data. Lower scores indicate more frequent or severe violations relative to the number of water systems in the state.

#	State	Health violations	Unresolved	Total violations	Violation score	Cities tracked
1	Alaska	3,012	2,974	56,191	8.9/40	79
2	Oklahoma	21,214	6,756	66,672	13.9/40	358
3	New Mexico	6,055	11,715	34,220	14.2/40	163
4	Oregon	4,806	7,707	73,832	16.2/40	213
5	Pennsylvania	6,048	17,905	184,848	16.7/40	560
6	West Virginia	2,170	8,290	32,975	16.7/40	248
7	Connecticut	2,712	6,677	43,448	16.8/40	158
8	Mississippi	2,697	5,346	129,726	18.3/40	320
9	Montana	2,633	4,010	37,407	19.6/40	115
10	Colorado	4,426	5,618	48,712	20.2/40	246
11	Arizona	5,179	14,082	127,580	20.4/40	292
12	Idaho	5,388	2,778	35,478	20.8/40	139
13	Louisiana	10,159	8,905	22,059	21.1/40	309
14	Wyoming	847	1,135	11,467	23.2/40	65
15	Texas	27,543	46,074	146,598	23.7/40	1,067
16	Utah	1,530	2,886	42,246	23.7/40	177
17	Florida	5,383	6,498	37,712	24.1/40	388
18	Washington	7,363	7,150	120,280	24.2/40	294
19	New Hampshire	3,508	2,847	19,091	24.7/40	119
20	North Carolina	5,427	16,902	86,929	25.1/40	417

States with strongest compliance records

Understanding drinking water violations

Types of violations

The EPA tracks four main violation categories. Health-based violations are most serious: MCL exceedances (a regulated contaminant exceeds its maximum allowed level), treatment technique failures (required treatment not properly implemented), and acute violations (immediate health risk, e.g., total coliform or E. coli). Monitoring violations occur when systems fail to test as required — concerning because untested water may harbor undetected contamination. Reporting violations occur when utilities fail to notify customers. Other violations cover administrative failures.

Who is most at risk

Small water systems (serving fewer than 10,000 people) account for the majority of violations but serve a smaller share of the population. Rural communities in states with less regulatory oversight and enforcement capacity face higher violation rates. Economically disadvantaged communities often lack the funding for infrastructure maintenance and treatment upgrades. Native American tribal water systems have some of the highest per-capita violation rates of any demographic in the US — a legacy of chronically underfunded infrastructure.

The Safe Drinking Water Act

Congress passed the SDWA in 1974 after public concern about industrial and agricultural chemical contamination. Major amendments in 1986 and 1996 strengthened requirements, established the right-to-know CCR reporting requirement, and created source water protection programs. The EPA currently enforces Maximum Contaminant Levels (MCLs) for 90+ regulated contaminants. States can receive "primacy" — delegated enforcement authority — if they adopt standards at least as stringent as federal requirements. 49 states have primacy; Wyoming is the exception.

What happens when a system violates

Health-based violations trigger a legal obligation to notify customers within 24 hours (acute violations) or 30 days (non-acute MCL exceedances). Systems must publish violations in their annual Consumer Confidence Report. Enforcement follows a tiered process: informal compliance assistance, formal administrative orders with penalties up to $25,000/day, and ultimately referral to the Department of Justice for federal court action. However, critics note enforcement is often slow and penalties insufficient to drive timely compliance in under-resourced systems.

Why unresolved violations persist

Violations remain "unresolved" when systems have not returned to compliance within the required timeframe. This can reflect genuine infrastructure problems (treatment systems that need expensive upgrades), operator certification issues, financial insolvency, or regulatory capacity constraints in state programs. A 2021 NRDC report found that chronic violators — systems with recurring violations over multiple years — are disproportionately likely to be small, rural, and serving low-income or minority populations. Some systems have been in violation for 5+ years.

Infrastructure investment and the path forward

The 2021 Bipartisan Infrastructure Law allocated $55 billion for water infrastructure over 5 years — including $15B for lead pipes, $10B for PFAS, and $23.4B in general Drinking Water State Revolving Fund (DWSRF) grants and loans. The EPA's Water Technical Assistance (WaterTA) program provides free engineering help to struggling systems. Despite these investments, the American Society of Civil Engineers' 2021 infrastructure report card gave US drinking water infrastructure a C- rating, estimating $473 billion in needed investment over 20 years.

What types of violations are most common?

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MCL Exceedances

A regulated contaminant exceeds its Maximum Contaminant Level. Includes arsenic, nitrate, coliform, disinfection byproducts, and more. Requires immediate customer notification.

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Treatment Technique Failures

Required treatment wasn't properly applied — e.g., inadequate filtration for surface water systems or failure to maintain disinfectant residuals. Often linked to operator error or aging equipment.

📊

Monitoring Violations

System failed to test for required contaminants on schedule. Among the most common violation type. If a system isn't testing, contamination can go undetected — making these violations a serious public health blind spot.

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Public Notification Failures

System failed to notify customers of a violation within required timeframes (24 hours for acute violations, 30 days for others). Customers have a legal right to know when their water doesn't meet standards.

Safe Drinking Water Act: 50 years of federal oversight

The SDWA was passed in 1974 but has been strengthened significantly over the decades — often in response to high-profile contamination crises.

1974 Safe Drinking Water Act signed into law

Congress passes the SDWA establishing EPA authority to set national drinking water standards and requiring public water systems to test for and control contaminants. The original law focused primarily on bacterial contamination and a limited set of industrial chemicals. States can receive "primacy" — delegated enforcement authority — if they adopt standards at least as stringent as EPA's.

1986 Major amendments add 83 new contaminants

Congress amends the SDWA to require EPA to regulate 83 specific contaminants and ban lead in plumbing. The amendments also establish the wellhead protection program and increase federal enforcement authority. States and utilities face substantially expanded compliance obligations.

1996 Consumer Confidence Reports and source water protection

The 1996 SDWA amendments require utilities to send annual Consumer Confidence Reports (CCRs) to all customers — the "right to know" provision. The amendments also create the Drinking Water State Revolving Fund (DWSRF) for infrastructure financing and establish source water protection and operator certification programs.

2011 EPA launches SDWIS database — public access to violations data

EPA expands public access to the Safe Drinking Water Information System, enabling researchers, journalists, and advocacy groups to analyze violations data at scale. This database powers independent watchdog reporting and tools like WaterVerge. NRDC's 2017 analysis using this data — "Watered Down Justice" — found systematic enforcement failures disproportionately affecting communities of color.

2021 Bipartisan Infrastructure Law — $55B for water infrastructure

The largest federal investment in water infrastructure in US history: $15B for lead pipe replacement, $10B for PFAS treatment, and $23.4B through the Drinking Water State Revolving Fund for general compliance and upgrades. Despite the scale, the American Society of Civil Engineers estimated $473B in needed investment over 20 years — this funding addresses roughly 12% of the need.

2024 Most significant regulatory year in decades — PFAS MCLs + LCRI

2024 brings two landmark rules: the first-ever PFAS Maximum Contaminant Levels (April) and the Lead and Copper Rule Improvements (October). Together these rules require treatment upgrades for an estimated 130–170 million Americans' water supplies. Water systems face compliance deadlines through 2029, requiring the largest wave of drinking water infrastructure investment since the Clean Water Act era.

What the EPA actually regulates in tap water

The Safe Drinking Water Act gives EPA authority to regulate any contaminant that may pose a health risk. Of the 90+ contaminants currently regulated, violations are most common in these categories.

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Microbial contaminants

Total coliform, E. coli, Legionella, Giardia, Cryptosporidium. Cause the most immediate acute health risk — severe gastrointestinal illness, and potentially fatal for immunocompromised individuals. Treatment technique (disinfection, filtration) violations often drive these exceedances.

🌿

Nitrates & nitrites

MCL: 10 mg/L for nitrate, 1 mg/L for nitrite. Primarily an agricultural runoff problem. Causes "blue baby syndrome" (methemoglobinemia) in infants under 6 months. Among the most commonly violated MCLs in rural systems. Private wells (unregulated) have even higher exceedance rates.

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Disinfection byproducts

Trihalomethanes (TTHMs) and haloacetic acids (HAA5s) form when disinfectants like chlorine react with organic matter. MCL: 80 µg/L for TTHMs, 60 µg/L for HAA5s. Long-term exposure linked to bladder cancer and reproductive harm. A tension between disinfection (essential) and byproduct formation (harmful) that all utilities must manage.

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Arsenic

MCL: 10 ppb. Occurs naturally in groundwater, particularly in the West and New England. Long-term exposure causes bladder, kidney, and skin cancers. When EPA lowered the MCL from 50 ppb to 10 ppb in 2006, hundreds of small systems — primarily serving rural communities — fell into violation.

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Radionuclides

Radium, uranium, gross alpha particles, and beta/photon emitters. MCL: 5 pCi/L for combined radium-226/228. Naturally occurring in certain rock formations — highest in Midwest states with glacial aquifers. Long-term exposure increases cancer risk. Small systems often lack the treatment capacity for removal.

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Emerging contaminants

PFAS (newly regulated in 2024), 1,4-dioxane, perchlorate, and microplastics represent the frontier of drinking water regulation. Thousands of industrial chemicals used since WWII have never been tested for health effects in drinking water. The SDWA's "contaminant candidate list" process — added in 1996 — monitors unregulated contaminants for potential future regulation.

Frequently asked questions

How do I find out if my water system has violations?

Search for your city on WaterVerge to see its full violation history. You can also request your water system's Consumer Confidence Report (CCR), which must be mailed to customers annually by July 1st and published online. For more detail, search EPA's ECHO database (echo.epa.gov) by your water system name or PWSID number. Your state drinking water program website also maintains violation records.

Should I stop drinking tap water if my system has a violation?

It depends on the violation type and severity. Acute health-based violations (E. coli, nitrate above MCL) may warrant switching to bottled water or using a certified filter immediately. Non-acute MCL exceedances for chronic contaminants pose lower immediate risk. Monitoring violations alone don't mean your water is unsafe — they mean testing wasn't done. Contact your water utility for specific guidance and check if a boil water advisory is in effect. When in doubt, use a certified filter appropriate for your water's known issues.

Why does my state have so many violations if the water tastes fine?

Most water contaminants are colorless, odorless, and tasteless at concentrations that still cause health harm. Lead, arsenic, nitrate, PFAS, and many disinfection byproducts are completely undetectable by taste or smell at MCL levels. This is precisely why mandatory testing and reporting exist. "Tastes fine" is not a reliable indicator of water safety — it's why violations data matters.

What's the difference between a health-based violation and a monitoring violation?

A health-based violation means a contaminant was measured and found to exceed the legal limit — a confirmed problem. A monitoring violation means required testing wasn't conducted — an absence of data, not confirmed contamination. Both are concerning, but for different reasons: health-based violations represent known risks; monitoring violations represent unknown risks because the system isn't looking.

Check violations in your city

Search for your city to see its full violation history, current status, enforcement actions, and how it compares to state and national benchmarks.

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