D26/100
Hanford Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 65,154 residents · California
What's In Hanford's Tap Water?
66
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2023 – August 8, 2024Rule: Ground Water RuleEnforcement: Formal — state order issued
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
HANFORD, CITY OF
Population Served
62,127
Water Source
Groundwater
System ID
CA1610003
STRATFORD PUD
Population Served
1,277
Water Source
Groundwater
System ID
CA1610006
HOME GARDEN CSD
Population Served
1,750
Water Source
Groundwater
System ID
CA1610007
Frequently Asked Questions About Hanford Water
Is Hanford tap water safe to drink?
Hanford, California tap water receives a grade of D (26/100), which is considered poor. 0 contaminant(s) exceed EPA maximum contaminant levels and 202 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Hanford's water?
Of the 66 contaminants tested in Hanford's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Hanford have any water quality violations?
Yes, Hanford has 202 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, MCL, Other. 171 of these are health-based violations, which are the most serious category.
Do I need a water filter in Hanford?
Hanford water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does Hanford's tap water come from?
Hanford's drinking water is sourced from groundwater and supplied by HANFORD, CITY OF and 2 other water system(s). The system serves approximately 65,154 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Hanford's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Hanford's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Hanford's water compare to other cities in California?
Hanford's water quality score of 26/100 earns a grade of D, which is considered poor. This is a concerning score that suggests significant water quality issues. Visit our California state page to see how all cities in the state compare.
What should I do if I'm concerned about Hanford's water quality?
If you have concerns about Hanford's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (HANFORD, CITY OF) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.