Nitrate (as N) in Caldwell water
4 systems serving Caldwell detected Nitrate (as N) in the last 36 months. 1 is elevated. The federal MCL is 10.00ppm.
| System | 36 mo max | Latest | Status | Last sample |
|---|---|---|---|---|
| Caldwell Housing Authority | 5.50ppm | 4.90ppm | Elevated | 2025-06-16 |
| City of Caldwell | 2.30ppm | 0.30ppm | Detected | 2026-04-15 |
| Lakeys Cafe and Trailer Park | 0.60ppm | 0.60ppm | Detected | 2026-02-09 |
| H and L Park | 0.60ppm | 0.60ppm | Detected | 2026-02-09 |
Infants below the age of six months who drink water containing nitrate in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome.EPA, quoted. This site does not paraphrase health guidance; for infants and pregnancy, read the agency text as written.
Nitrate (as N) in Treasure Valley drinking water. Caldwell water quality.
Numbers are the system's samples at its taps and wells, not yours. Lead and copper are 90th percentiles from sampled homes. Well pages are nearby-sample estimates. Health text restates EPA and DEQ. Methodology.