Water Quality Report · Updated October 07, 2026
HANFORD, CITY OF
HANFORD, CITY OF delivers tap water graded D (64/100) by TapWaterSafety.org. The utility serves approximately 62,127 residents in HANFORD, California using groundwater. 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. For questions, the utility can be reached at 559-585-2567.
Is HANFORD tap water safe to drink?
HANFORD, CITY OF delivers tap water that earns a grade of D (64/100) from TapWaterSafety.org — a below-average rating, with multiple concerns including arsenic significantly above health guideline.
The utility serves 62,127 residents in HANFORD, drawing from groundwater.
Public testing data identifies 10 contaminants in this water above EWG's health-based guidelines, including: Arsenic, Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Haloacetic acids (HAA9), Dibromoacetic acid, Dibromochloromethane, Bromoform, Bromodichloromethane, Chloroform, Dichloroacetic acid. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
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.
Quick actions for HANFORD residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for HANFORD, CITY OF.
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.
Contact HANFORD, CITY OF
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for HANFORD
Filters matched to the specific contaminants in this 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.
Score breakdown
This utility's overall score of 64/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
HANFORD, CITY OF service area
This water system serves 1 community in Kings County, California. Click any city for its dedicated tap water quality page.
Find the right filter for HANFORD water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.