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F0/100

COMANCHE CO RWD #4 — Water Quality Report 2026

Serving 3,000 people · Oklahoma

Water Source
Purchased Surface Water
County
—
System ID
OK3001654
Violations
64

Contaminant Test Results

1 contaminant above EPA health goals
ContaminantDetectedLimit (MCL)Status
Copper (90th percentile)
1.72 mg/L1.30 mg/LOver Limit

EPA Violation History

9

Violations (last 5yr)

7

Unresolved

7

Health-Related

TIER 3Unresolved

Failed to conduct Level 2 Assessment

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: September 29, 2025Rule: Stage 2 DBPRVerify on EPA.gov
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: April 1, 2025 – June 30, 2025Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: April 1, 2025 – June 30, 2025Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
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 – July 15, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved

Treatment technique violation

When: October 17, 2024 – July 15, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: October 1, 2021 – December 31, 2021Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: October 1, 2021 – December 31, 2021Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: July 1, 2021 – September 30, 2021Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: July 1, 2021 – September 30, 2021Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov

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

Frequently Asked Questions About COMANCHE CO RWD #4

Is COMANCHE CO RWD #4 water safe to drink?

COMANCHE CO RWD #4 water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 64 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has COMANCHE CO RWD #4 detected?

5 contaminants were tested in COMANCHE CO RWD #4's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).

Does COMANCHE CO RWD #4 have any EPA violations?

Yes, COMANCHE CO RWD #4 has 64 EPA violation(s) on record, with the most recent in 2025. Violation types include MR, MCL, RPT. 45 are health-based violations.

How many people does COMANCHE CO RWD #4 serve?

COMANCHE CO RWD #4 serves approximately 3,000 people, Oklahoma.

What type of water does COMANCHE CO RWD #4 provide?

COMANCHE CO RWD #4 sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is OK3001654.

How does COMANCHE CO RWD #4 compare to other utilities in Oklahoma?

COMANCHE CO RWD #4 scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Oklahoma state page for a full comparison of water systems.