Antimony in drinking water
856 active public water systems in 43 states had a Antimony violation in the past three years, and 15 had one in the latest quarter of EPA's data.
You are on Tapcensus, an independent guide to the EPA compliance records of every public water system in the United States. This page explains Antimony and lists the water systems whose records include a related violation. It does not show measured levels.
Is Antimony in the records for your water system?
Enter a ZIP code, town, or street address to see the water systems that serve your area, their status, and which rules and contaminants appear in their violations.
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What it is and where it comes from
Antimony is a metalloid found in natural mineral deposits and released through industrial activities including flame retardant manufacturing, metal smelting, and coal combustion. It can leach into water from certain pipe coatings and solders. Background levels in US drinking water are generally low, with violations rare.
Health effects
Long-term exposure to antimony in drinking water is associated with increased blood cholesterol, decreased blood glucose, and potential cardiovascular effects. Animal studies suggest reproductive and developmental toxicity at elevated doses. EPA classifies it as a possible human carcinogen (Group C) based on animal data.
The standard and what a violation means
EPA limit: 0.006 mg/L (6 ppb).
Water systems with a Antimony violation, by state
Active public water systems that reported at least one related violation to EPA in the past three years. Each state links to the list of its affected systems.
| State | Systems with violations, 3 yr | Share of active systems | In violation, latest quarter |
|---|---|---|---|
| Pennsylvania | 112 | 1% | 0 |
| Texas | 73 | 1% | 0 |
| Illinois | 70 | 1% | 2 |
| Georgia | 61 | 3% | 0 |
| New York | 54 | 1% | 0 |
| Michigan | 51 | 0% | 0 |
| Colorado | 29 | 1% | 4 |
| Indiana | 29 | 1% | 0 |
| West Virginia | 29 | 4% | 0 |
| New Jersey | 27 | 1% | 0 |
| California | 24 | 0% | 0 |
| Montana | 23 | 1% | 0 |
| Wyoming | 22 | 3% | 0 |
| Missouri | 21 | 1% | 2 |
| Oklahoma | 21 | 2% | 0 |
| Washington | 21 | 0% | 0 |
| Idaho | 18 | 1% | 1 |
| Connecticut | 17 | 1% | 0 |
| Virginia | 15 | 1% | 0 |
| Maine | 13 | 1% | 0 |
| Oregon | 13 | 1% | 0 |
| Wisconsin | 12 | 0% | 0 |
| Massachusetts | 11 | 1% | 2 |
| Utah | 11 | 1% | 1 |
| Iowa | 8 | 0% | 0 |
| Nevada | 8 | 1% | 0 |
| Alaska | 7 | 1% | 0 |
| Mississippi | 7 | 1% | 0 |
| Vermont | 7 | 1% | 2 |
| North Carolina | 6 | 0% | 0 |
| Arizona | 5 | 0% | 1 |
| Maryland | 5 | 0% | 0 |
| Minnesota | 5 | 0% | 0 |
| Alabama | 4 | 1% | 0 |
| Florida | 3 | 0% | 0 |
| New Hampshire | 3 | 0% | 0 |
| Rhode Island | 3 | 1% | 0 |
| Kansas | 2 | 0% | 0 |
| South Dakota | 2 | 0% | 0 |
| Hawaii | 1 | 1% | 0 |
| Kentucky | 1 | 0% | 0 |
| North Dakota | 1 | 0% | 0 |
| New Mexico | 1 | 0% | 0 |
Largest water systems with a Antimony violation
The ten biggest systems, by people served, whose records include a related violation in the past three years.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Aqua PA Main System Montgomery County |
822,600 | 6 | 0 | |
|
Aquarion-Eastern Fairfield County Beacon Falls, Bridgeport, Darien and 17 more · Fairfield County |
351,756 | 2 | 0 | |
|
Corona, City of Corona · Riverside County |
169,380 | 6 | 0 | |
|
City of Sunnyvale Sunnyvale · Santa Clara County |
157,566 | 5 | 0 | |
|
Aqua WSC Bastrop County |
86,325 | 5 | 1 | |
|
GW Santa Cruz Water CO Maricopa · Pinal County |
84,000 | 7 | 0 | |
|
Tigard, City of Washington County |
62,500 | 2 | 0 | |
|
Greenlawn Water District Huntington (t) · Suffolk County |
42,000 | 3 | 0 | |
|
Winslow Twp Dmu Winslow Twp · Camden County |
39,174 | 6 | 0 | |
|
Bullhead City Mohave Bullhead City · Mohave County |
36,330 | 13 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Antimony, including monitoring and reporting lapses. Rules violated and status in the systems table are for the whole system, not Antimony alone. Counts cover active systems in all 50 states and the District of Columbia.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.