Is Walnut Creek, OH Tap Water Safe to Drink?
Graded B — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
79/100
waterverge.com Walnut Creek, OH — Water Quality Report
Walnut Creek's drinking water received a grade of B (79 out of 100), indicating good water quality. The city's 1 water system serves approximately 1,270 residents using groundwater.
Lead levels were measured at 1.6 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 95 violations on record, including 3 health-based violations. 8 remain unresolved.
What to know about Walnut Creek's water
Walnut Creek ranks #292 out of 511 cities in Ohio for water quality, placing it below average in the state.
Walnut Creek relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
As a small community water system, Walnut Creek may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Walnut Creek, OH water safe to drink?
Walnut Creek's drinking water has significant quality concerns based on EPA testing data. With a grade of B (79/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 1,270 residents using groundwater (wells).
Recent water quality updates for Walnut Creek
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Walnut Creek's water quality assessment. Grade: B (79/100).
1 health-based. Contaminants: LEAD AND COPPER RULE REVISIONS.
Contaminants: Consumer Confidence Rule.
Contaminants: Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-3250). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Walnut Creek's water supply.
Well within EPA limits.
Exceeds EPA action level. Copper can leach from household plumbing — flush taps for 30 seconds before drinking.
Violation history
Walnut Creek's water system has 95 total violations on record, including 3 health-based violations. 8 remain unresolved. 3 violations were issued in the last 5 years.
Flood & environmental risk
Holmes County has experienced 1 federally declared disaster since 2005. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies.
Where does Walnut Creek's water come from?
Walnut Creek's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,270 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Walnut Creek residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Walnut Creek's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Top industrial polluters within 10 miles of Walnut Creek
Industrial polluters nearby
Reported releases to surface water by facilities near Walnut Creek, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
WESTLAKE ROYAL STONE LLC - DUTCH QUALITY MOUNT EATON, OH44659 | — | — | 9.7 mi |
ARE ACCESSORIES LLC MOUNT EATON, OH44659 | — | — | 9.9 mi |
RPM INDUSTRIAL COATINGS GROUP INC DBA FINISHWORKS MILLERSBURG, OH44654 | — | — | 3.5 mi |
WAYNE-DALTON CORP MOUNT HOPE, OH44660 | — | — | 6.1 mi |
BELDEN BRICK CO PLANT 2 SUGARCREEK, OH44681 | — | — | 5.3 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Holmes County has experienced 1 federally declared disaster since 2005. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Walnut Creek's water supply, we recommend the following filter types.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 1.6 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 1.59 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level (90th percentile)
Latest reading: 1.600 mg/L (1993)
EPA action level: 1.3 mg/L
See how Walnut Creek compares by contaminant
Explore where Walnut Creek ranks among all Ohio cities for specific contaminants.
Water source & infrastructure
Where Walnut Creek's water comes from
Walnut Creek's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by private ownership and serves approximately 1,270 people through 1 water system.
Water systems serving Walnut Creek
| System Name | PWSID | Population | Source |
|---|---|---|---|
| WALNUT CREEK WATER CO. | OH3801512 | 1,270 | GW |
How Walnut Creek compares
Full Ohio rankings →Walnut Creek's score of 79/100 is above the average of 58/100 among major Ohio cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Ohio rankings →About Walnut Creek, OH
Learn more about your water
Guides and resources related to Walnut Creek's water quality findings.
Explore water quality across Holmes
Frequently asked questions
Is Walnut Creek, OH tap water safe to drink?
Walnut Creek's water quality earned a grade of B (79/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #292 out of 511 cities tested in Ohio.
What contaminants are in Walnut Creek's water?
Lead was measured at 1.6 ppb (90th percentile). 95 violations are on record.
How is Walnut Creek's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Walnut Creek?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Walnut Creek's water come from?
Walnut Creek's water is sourced from Groundwater. The city has 1 water system serving approximately 1,270 residents.
What health violations has Walnut Creek's water system had?
Walnut Creek has 3 health-based violations on record. The most recent violation was recorded in October 2024. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 8 violations remain unresolved.
Is Walnut Creek's groundwater at risk of contamination?
Walnut Creek uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 95 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Walnut Creek's water compare to other cities?
Walnut Creek ranks #292 out of 511 cities in Ohio (better than 43% of state cities) and #8440 out of 15744 cities nationally (46th percentile). The grade of B reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Walnut Creek's small water system affect quality?
Walnut Creek's system serves approximately 1,270 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 95 violations on record.