Tap Water Quality Report
Tap water quality in NAMPA, Idaho
Tap water in NAMPA, Idaho receives a grade of D (60/100) from TapWaterSafety.org. It's served by NAMPA CITY OF. The most significant water quality concerns are: Arsenic significantly above health guideline; Chromium (hexavalent) significantly above health guideline; Dibromoacetic acid significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in NAMPA's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving NAMPA.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 4.74 ppb, 1184x above the EWG health guideline of 0.004 ppb.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 2.62 ppb, 131x above the EWG health guideline of 0.02 ppb.
Dibromoacetic acid significantly above health guideline
Moderate concernDibromoacetic acid detected at 1.17 ppb, 39x above the EWG health guideline of 0.03 ppb.
Recommended filters for NAMPA
Filters matched to the specific contaminants in NAMPA's water supply.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in NAMPA's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Arsenic Heavy metal |
4.74 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 1184× over |
| Chromium (hexavalent) Heavy metal |
2.62 ppb | 0.02 | — | — | — | — | — | 131× over |
| Dibromoacetic acid Disinfection byproduct |
1.17 ppb | 0.03 | — | — | — | — | — | 39× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
4.1 ppb | 0.15 | 80.0 | 100 | — | — | — | 27× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
1.36 ppb | 0.06 | — | — | — | — | — | 23× over |
| Uranium Radiological |
9.49 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 22× over |
| Nitrate Inorganic |
2.22 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 16× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
1.1 ppb | 0.1 | 60.0 | 60 | — | — | — | 11× over |
| Radium, combined (-226 and -228) Radiological |
0.53 pCi/L | 0.05 | 5.0 | — | — | — | — | 11× over |
| Bromoform Disinfection byproduct |
3.46 ppb | 0.5 | — | — | — | — | — | 6.9× over |
| Dibromochloromethane Disinfection byproduct |
0.636 ppb | 0.1 | — | — | — | — | — | 6.4× over |
| Nitrate and nitrite Inorganic |
0.5 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 3.6× over |
| Vanadium Other |
11.4 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Bromochloromethane Other |
0.0123 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
3.09 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
52.2 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Manganese Heavy metal |
2.75 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Chlorate Disinfection byproduct |
2.01 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.254 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
1.22 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.582 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.85 ppb | — | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from NAMPA CITY OF.