F0/100
Walnut Creek Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 1,270 residents · Ohio
What's In Walnut Creek's Tap Water?
2
Contaminants Tested
1
Exceed EPA Limits
1
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.59 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
3
Violations (last 5yr)
1
Unresolved
1
Health-Related
TIER 3Resolved
Reporting violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 17, 2024 – October 31, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved
Treatment technique violation
When: October 17, 2024 – October 31, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved
Surface water treatment technique failure
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
WALNUT CREEK WATER CO.
Population Served
1,270
Water Source
Groundwater
System ID
OH3801512
Frequently Asked Questions About Walnut Creek Water
Is Walnut Creek tap water safe to drink?
Walnut Creek, Ohio tap water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA maximum contaminant levels and 94 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Walnut Creek's water?
Of the 2 contaminants tested in Walnut Creek's water supply, the most notable include Copper (90th percentile), Lead (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Walnut Creek have any water quality violations?
Yes, Walnut Creek has 94 EPA violation(s) on record, with the most recent in 2024. Violation types include RPT, TT, Other. 3 of these are health-based violations, which are the most serious category.
Do I need a water filter in Walnut Creek?
Based on EPA data, using a water filter in Walnut Creek is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Walnut Creek's tap water come from?
Walnut Creek's drinking water is sourced from groundwater and supplied by WALNUT CREEK WATER CO.. The system serves approximately 1,270 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Walnut Creek'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. Walnut Creek'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 Walnut Creek's water compare to other cities in Ohio?
Walnut Creek's water quality score of 0/100 earns a grade of F, which is considered failing. This is a concerning score that suggests significant water quality issues. Visit our Ohio state page to see how all cities in the state compare.
What should I do if I'm concerned about Walnut Creek's water quality?
If you have concerns about Walnut Creek'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 (WALNUT CREEK WATER CO.) 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.