Tap Water Quality Report
Tap water quality in HANFORD, California
Tap water in HANFORD, California receives a grade of D (64/100) from TapWaterSafety.org. It's served by HANFORD, CITY OF. The most significant water quality concerns are: Arsenic significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in HANFORD's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving HANFORD.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 3.19 ppb, 797x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 36.2 ppb, 362x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 45.2 ppb, 301x above the EWG health guideline of 0.15 ppb.
EPA compliance record
Official U.S. EPA records for HANFORD, CITY OF (system ID CA1610003) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Lead and Copper Rule | Missed testing or reporting | 10/01/2023 | Open |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for HANFORD
Filters matched to the specific contaminants in HANFORD's water supply.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
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 HANFORD'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 |
3.19 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 797× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
45.2 ppb | 0.15 | 80.0 | 100 | — | — | — | 301× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
18.0 ppb | 0.06 | — | — | — | — | — | 300× over |
| Dibromoacetic acid Disinfection byproduct |
7.28 ppb | 0.03 | — | — | — | — | — | 243× over |
| Dibromochloromethane Disinfection byproduct |
9.22 ppb | 0.1 | — | — | — | — | — | 92× over |
| Bromoform Disinfection byproduct |
31.8 ppb | 0.5 | — | — | — | — | — | 64× over |
| Bromodichloromethane Disinfection byproduct |
2.96 ppb | 0.06 | — | — | — | — | — | 49× over |
| Chloroform Disinfection byproduct |
1.16 ppb | 0.4 | — | — | — | — | — | 2.9× over |
| Dichloroacetic acid Disinfection byproduct |
0.333 ppb | 0.2 | — | — | — | — | — | 1.7× over |
| Nitrate and nitrite Inorganic |
0.0718 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Molybdenum Other |
10.1 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Trichloroacetic acid Disinfection byproduct |
0.0229 ppb | 0.1 | — | — | — | — | — | Below guideline |
| Aluminum Heavy metal |
120.9 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Nitrate Inorganic |
0.0188 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Manganese Heavy metal |
11.2 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Selenium Heavy metal |
0.809 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Vanadium Other |
0.209 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.0417 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0683 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
1.31 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
7.88 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 HANFORD, CITY OF.