A84/100
Westerville Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 29,471 residents · Ohio
What's In Westerville's Tap Water?
32
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 106.00 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
1
Health-Related
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: October 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
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
AQUA OHIO - BLACKLICK
Population Served
7,100
Water Source
Groundwater
System ID
OH2502412
AQUA OHIO - HUBER RIDGE PWS
Population Served
6,950
Water Source
Groundwater
System ID
OH2502512
AQUA OHIO - LAKE DARBY
Population Served
3,562
Water Source
Groundwater
System ID
OH2502612
AQUA OHIO - WORTHINGTON HILLS PWS
Population Served
2,500
Water Source
Groundwater
System ID
OH2502812
AQUA OHIO - LAWRENCE COUNTY
Population Served
8,130
Water Source
Purchased Surface Water
System ID
OH4400803
AQUA OHIO - LAKE WHITE PWS
Population Served
1,229
Water Source
Purchased Groundwater
System ID
OH6600312
Frequently Asked Questions About Westerville Water
Is Westerville tap water safe to drink?
Westerville, Ohio tap water receives a grade of A (84/100), which is considered excellent. Out of 32 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 1 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Westerville's water?
Of the 32 contaminants tested in Westerville's water supply, the most notable include Copper (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Westerville have any water quality violations?
Yes, Westerville has 32 EPA violation(s) on record, with the most recent in 2024. Violation types include MCL, MR. 11 of these are health-based violations, which are the most serious category.
Do I need a water filter in Westerville?
Based on EPA data, using a water filter in Westerville 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 Westerville's tap water come from?
Westerville's drinking water is sourced from groundwater and supplied by AQUA OHIO - BLACKLICK and 5 other water system(s). The system serves approximately 29,471 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Westerville'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. Westerville'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 Westerville's water compare to other cities in Ohio?
Westerville's water quality score of 84/100 earns a grade of A, which is considered excellent. This places Westerville among the better-performing water systems in Ohio. Visit our Ohio state page to see how all cities in the state compare.
What should I do if I'm concerned about Westerville's water quality?
If you have concerns about Westerville'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 (AQUA OHIO - BLACKLICK) 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.