What Chromium is, and why it's regulated
What the EPA limit means
100 µg/L
Maximum Contaminant Level — the enforceable ceiling a supplier must stay under.
100 µg/L
Health goal (MCLG) — the level with no known health effect. It is a goal, not a legal limit, and is often zero for carcinogens.
SYR4
Where these measurements come from. Hover the tag for the EPA programme and years.
Where Chromium was found
The water suppliers reporting the highest levels, worst first. For lead and copper that is the 90th-percentile result the action level is written against; for Six-Year Review data, the 95th percentile of each system's samples.
| Supplier | City | State | Level vs EPA limit |
|---|---|---|---|
| Iowa Tribe of Ks & Ne | White Cloud | KS | 3420.73 µg/L 3421% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| Springtree Apts | Tampa | FL | 870 µg/L 870% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| Poco Apartments (Lower) | Stroudsburg | PA | 463 µg/L 463% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| Ak-Chin Village | Ak-Chin Village | AZ | 260 µg/L 260% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| Los Angeles-City, Dept. of Water & Power | Los Angeles | CA | 171.5 µg/L 172% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| Greenfield Ranchettes | Chandler | AZ | 171.36 µg/L 171% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| Ventura River Water District | Ojai | CA | 156.8 µg/L 157% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| Camp Pendleton (North) | Camp Pendleton | CA | 150.2 µg/L 150% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| Hometown Colonial Estates Llc | Rancho Cordova | CA | 150 µg/L 150% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| Ramona Water Company | Anza | CA | 140 µg/L 140% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| Aqua Ohio - Mansfield System #07 | — | OH | 133.5 µg/L 134% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| City of Fairfield | Fairfield | CA | 131.75 µg/L 132% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| Double R Water Distributors, Inc. | Yucca | AZ | 120.4 µg/L 120% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| City of Vacaville | Vacaville | CA | 112.1 µg/L 112% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| Hills Ranch Mutual Water Company | Mendocino | CA | 110 µg/L 110% of the EPA limit, at the 95th percentile of samples — 100 µg/L |
| Wales Town Water System | Wales | UT | 100 µg/L 100% of the EPA limit 100 µg/L |
| Jeffrey City Water & Sewer District | Riverton | WY | 100 µg/L 100% of the EPA limit 100 µg/L |
| Glendale-City, Water Dept. | Glendale | CA | 100 µg/L 100% of the EPA limit 100 µg/L |
| Hill Air Force Base | — | UT | 100 µg/L 100% of the EPA limit 100 µg/L |
| City of Benicia | Benicia | CA | 92.115 µg/L 92% of the EPA limit 100 µg/L |
| City of Vallejo | Vallejo | CA | 92.115 µg/L 92% of the EPA limit 100 µg/L |
| Napa, City of | Napa | CA | 92.115 µg/L 92% of the EPA limit 100 µg/L |
| Travis Afb Wtp - Vallejo | Vallejo | CA | 92.115 µg/L 92% of the EPA limit 100 µg/L |
| Kingman Municipal Water | Kingman | AZ | 90.2 µg/L 90% of the EPA limit 100 µg/L |
| Lander, City of | Lander | WY | 90 µg/L 90% of the EPA limit 100 µg/L |
Frequently asked questions about Chromium
What is Chromium in drinking water?
Chromium reaches water from natural deposits and industrial discharge; long-term exposure can cause allergic dermatitis.
What is the EPA limit for Chromium?
The EPA's Maximum Contaminant Level for Chromium is 100 µg/L, and its health goal (MCLG) is 100 µg/L. A result above the limit means the supplier must act; the goal is the level at which no health effects are expected.
How common is Chromium in US tap water?
Of the 33,740 water suppliers with results on file, 10,760 detected Chromium — 31.9% of those tested.