What Nitrate-Nitrite is, and why it's regulated
What the EPA limit means
10000 µg/L
Maximum Contaminant Level — the enforceable ceiling a supplier must stay under.
10000 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 Nitrate-Nitrite was found
The water suppliers reporting the highest levels, worst first.
| Supplier | City | State | Level vs EPA limit |
|---|---|---|---|
| Palm Springs Crest | Desert Hot Springs | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Lake Hemet Mwd | Hemet | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Coachella Vwd: Cove Community | Palm Desert | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Riverside, City of | Riverside | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Desert Water Agency | Palm Springs | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Hemet, City of | Hemet | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Maher Rd Ws #05 | Royal Oaks | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Palmdale Water Dist. | Palmdale | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Soledad, City of | Soledad | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Napa, City of | Napa | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| American Canyon, City of | American Canyon | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| City of Huntington Beach | Huntington Beach | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Leisure Lake Mobile Estates | Chandler | AZ | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Alameda County Water District | Fremont | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Liberty Utilities - Bellflower-Norwalk | Downey | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| City of Martinez | Martinez | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Cws - Bakersfield | San Jose | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Bakersfield, City of | Bakersfield | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Riverside Csd | Ferndale | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Los Angeles Residential Community Founda | Santa Clarita | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Marina Coast Water District | Marina | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Pico Rivera - City, Water Dept. | Pico Rivera | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Maywood Mutual Water Co. #1 | Huntington Park | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Valley Water Co. | La Canada Flintridge | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
| Cal Am - Suburban Rosemont | Sacramento | CA | 1000000 µg/L 10000% of the EPA limit, in the worst sample — 10000 µg/L |
Frequently asked questions about Nitrate-Nitrite
What is Nitrate-Nitrite in drinking water?
Nitrate-nitrite is the combined measure of both nitrogen forms, mainly from fertiliser and sewage.
What is the EPA limit for Nitrate-Nitrite?
The EPA's Maximum Contaminant Level for Nitrate-Nitrite is 10000 µg/L, and its health goal (MCLG) is 10000 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 Nitrate-Nitrite in US tap water?
Of the 24,125 water suppliers with results on file, 18,509 detected Nitrate-Nitrite — 76.7% of those tested.