B70/100
Stillwell Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 1,025 residents · Oklahoma
What's In Stillwell's Tap Water?
2
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.38 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: July 1, 2022 – September 30, 2022Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway
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, 2021 – April 15, 2022Rule: Ground Water RuleEnforcement: 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
ADAIR CO RWD #4
Population Served
1,025
Water Source
Purchased Surface Water
System ID
OK3000107
Frequently Asked Questions About Stillwell Water
Is Stillwell tap water safe to drink?
Stillwell, Oklahoma tap water receives a grade of B (70/100), which is considered good. Out of 2 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 Stillwell's water?
Of the 2 contaminants tested in Stillwell'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 Stillwell have any water quality violations?
Yes, Stillwell has 22 EPA violation(s) on record, with the most recent in 2022. Violation types include MR, MON, Other. None of these are classified as health-based violations.
Do I need a water filter in Stillwell?
Based on EPA data, using a water filter in Stillwell 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 Stillwell's tap water come from?
Stillwell's drinking water is sourced from purchased surface water and supplied by ADAIR CO RWD #4. The system serves approximately 1,025 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Stillwell'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. Stillwell'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 Stillwell's water compare to other cities in Oklahoma?
Stillwell's water quality score of 70/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our Oklahoma state page to see how all cities in the state compare.
What should I do if I'm concerned about Stillwell's water quality?
If you have concerns about Stillwell'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 (ADAIR CO RWD #4) 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.