F0/100
ATOKA — Water Quality Report 2026
Serving 2,988 people · Oklahoma
Water Source
Surface Water
County
—
System ID
OK1010401
Violations
114
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
19
Violations (last 5yr)
11
Unresolved
18
Health-Related
TIER 2Unresolved
Treatment Technique Violation
When: April 1, 2025 – June 30, 2025Rule: Stage 1 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 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: January 1, 2025 – March 31, 2025Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Resolved
Failed treatment technique requirements
When: October 1, 2024 – October 31, 2024Rule: Surface Water Treatment RuleEnforcement: Formal — state order issued
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: August 1, 2024 – August 31, 2024Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: October 1, 2023 – December 31, 2023Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Unresolved
Treatment Technique Violation
When: October 1, 2023 – December 31, 2023Rule: Stage 1 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Unresolved
Treatment Technique Violation
When: July 1, 2023 – September 30, 2023Rule: Stage 1 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Unresolved
Treatment Technique Violation
When: April 1, 2023 – June 30, 2023Rule: Stage 1 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 1 — URGENTResolved
Violation related to Nitrate
When: March 1, 2023 – March 31, 2023Rule: Surface Water Treatment RuleEnforcement: Formal — state order issued
TIER 1 — URGENTResolved
Violation related to Nitrate
When: February 1, 2023 – February 28, 2023Rule: Surface Water Treatment RuleEnforcement: Formal — state order issued
TIER 1 — URGENTResolved
Violation related to Nitrate
When: January 1, 2023 – January 31, 2023Rule: Surface Water Treatment RuleEnforcement: Formal — state order issued
TIER 2Unresolved
Treatment Technique Violation
When: January 1, 2023 – March 31, 2023Rule: Stage 1 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 1 — URGENTResolved
Violation related to Nitrate
When: December 1, 2022 – December 31, 2022Rule: Surface Water Treatment RuleEnforcement: Formal — state order issued
TIER 2Resolved
Failed treatment technique requirements
When: December 1, 2022 – December 31, 2022Rule: Surface Water Treatment RuleEnforcement: Formal — state order issued
TIER 2Unresolved
Treatment Technique Violation
When: October 1, 2022 – December 31, 2022Rule: Stage 1 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 1 — URGENTResolved
Violation related to Nitrate
When: September 1, 2022 – September 30, 2022Rule: Surface Water Treatment RuleEnforcement: Formal — state order issued
TIER 2Unresolved
Treatment Technique Violation
When: July 1, 2021 – September 30, 2021Rule: Stage 1 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 ATOKA
Is ATOKA water safe to drink?
ATOKA water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 114 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has ATOKA detected?
21 contaminants were tested in ATOKA's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does ATOKA have any EPA violations?
Yes, ATOKA has 114 EPA violation(s) on record, with the most recent in 2025. Violation types include TT, MCL, MR. 102 are health-based violations.
How many people does ATOKA serve?
ATOKA serves approximately 2,988 people, Oklahoma.
What type of water does ATOKA provide?
ATOKA sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is OK1010401.
How does ATOKA compare to other utilities in Oklahoma?
ATOKA 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.