What do my water test results mean?
EPA limits
| Test | Limit | Why |
|---|---|---|
| Total Coliform Bacteria | None found | Health |
| E. coli | None found | Health |
| Nitrate | 10 mg/L as nitrogen | Health |
| Nitrite | 1 mg/L as nitrogen | Health |
| Arsenic | 0.01 mg/L | Health |
| Lead | 0.015 mg/L | Health |
| Copper | 1.3 mg/L | Health |
| Fluoride | 4 mg/L | Health |
| Uranium | 30 µg/L | Health |
| Manganese | 0.05 mg/L | Taste or stains |
| Iron | 0.3 mg/L | Taste or stains |
| Hardness | Over 180 is very hard | No federal limit |
| pH | 6.5 to 8.5 | Taste or stains |
| Total Dissolved Solids (TDS) | 500 mg/L | Taste or stains |
| Sulfate | 250 mg/L | Taste or stains |
| Chloride | 250 mg/L | Taste or stains |
| Sodium | None | No federal limit |
| Radon (in water) | None | No federal limit |
| PFAS (PFOA and PFOS) | 4 ppt (ng/L) | Health |
From EPA and USGS pages checked October 1, 2026. Each name links to its source.