Tap Water Quality Report
Tap water quality in MERIDIAN, Idaho
Tap water in MERIDIAN, Idaho receives a grade of D (65/100) from TapWaterSafety.org. It's served by MERIDIAN WATER DEPT. The most significant water quality concerns are: Arsenic significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in MERIDIAN's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving MERIDIAN.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 0.853 ppb, 213x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 5.11 ppb, 85x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 4.06 ppb, 27x above the EWG health guideline of 0.15 ppb.
Recommended filters for MERIDIAN
Filters matched to the specific contaminants in MERIDIAN's water supply.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
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 MERIDIAN'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 |
0.853 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 213× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
5.11 ppb | 0.06 | — | — | — | — | — | 85× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
4.06 ppb | 0.15 | 80.0 | 100 | — | — | — | 27× over |
| Uranium Radiological |
10.23 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 24× over |
| Dibromochloromethane Disinfection byproduct |
1.11 ppb | 0.1 | — | — | — | — | — | 11× over |
| Dibromoacetic acid Disinfection byproduct |
0.311 ppb | 0.03 | — | — | — | — | — | 10× over |
| Bromodichloromethane Disinfection byproduct |
0.556 ppb | 0.06 | — | — | — | — | — | 9.3× over |
| Nitrate and nitrite Inorganic |
1.29 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 9.2× over |
| Nitrate Inorganic |
1.25 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 8.9× over |
| Chromium (hexavalent) Heavy metal |
0.122 ppb | 0.02 | — | — | — | — | — | 6.1× over |
| Radium, combined (-226 and -228) Radiological |
0.16 pCi/L | 0.05 | 5.0 | — | — | — | — | 3.2× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
0.211 ppb | 0.1 | 60.0 | 60 | — | — | — | 2.1× over |
| Bromoform Disinfection byproduct |
0.836 ppb | 0.5 | — | — | — | — | — | 1.7× over |
| Chloroform Disinfection byproduct |
0.325 ppb | 0.4 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
52.6 ppb | 100.0 | — | 50 | 80 | — | — | Fails EU |
| Bromochloromethane Other |
0.0156 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Atrazine Pesticide/Herbicide |
0.0236 ppb | 0.1 | 3.0 | 0.1 | 100 | 0.15 | — | Below guideline |
| Chlorate Disinfection byproduct |
47.3 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
61.4 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Dichloroacetic acid Disinfection byproduct |
0.0167 ppb | 0.2 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
1.63 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.773 ppb | 21.0 | — | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0044 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Cobalt Other |
0.0236 ppb | 70.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.284 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Di(2-ethylhexyl) adipate Other |
0.00815 ppb | 200.0 | 400.0 | — | — | — | — | Below guideline |
| Bromomethane Other |
0.00872 ppb | — | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
0.137 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.34 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.165 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 MERIDIAN WATER DEPT.