BLACKWELL MUNICIPAL AUTHORITY — Water Quality Report 2026
Serving 7,668 people · Oklahoma
Water Source
Surface Water
County
—
System ID
OK1021101
Violations
73
Contaminant Test Results
EPA Violation History
13
Violations (last 5yr)
4
Unresolved
10
Health-Related
TIER 1 — URGENTUnresolved
Violation related to Nitrate
When: July 1, 2025 – July 31, 2025Rule: Surface Water Treatment RuleEnforcement: Formal — state order issuedVerify on EPA.gov
TIER 1 — URGENTUnresolved
Violation related to Nitrate
When: June 1, 2025 – June 30, 2025Rule: Surface Water Treatment RuleEnforcement: Formal — state order issuedVerify on EPA.gov
TIER 3Unresolved
Missed required monitoring deadline
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: May 1, 2025 – May 31, 2025Rule: Surface Water Treatment RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Unresolved
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: May 1, 2025 – May 31, 2025Rule: Stage 1 DBPREnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved
Failed to conduct Level 2 Assessment
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: April 1, 2025 – May 6, 2025Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 1 — URGENTResolved
Violation related to Nitrate
When: January 1, 2025 – January 31, 2025Rule: Surface Water Treatment RuleEnforcement: Formal — state order issued
TIER 1 — URGENTResolved
Violation related to Nitrate
When: June 1, 2024 – June 30, 2024Rule: Surface Water Treatment RuleEnforcement: Formal — state order issued
TIER 1 — URGENTResolved
Violation related to Nitrate
When: March 1, 2024 – March 31, 2024Rule: Surface Water Treatment RuleEnforcement: Formal — state order issued
TIER 1 — URGENTResolved
Violation related to Nitrate
When: March 1, 2024 – March 31, 2024Rule: Surface Water Treatment RuleEnforcement: Formal — state order issued
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: January 1, 2023 – March 31, 2023Rule: Stage 2 DBPREnforcement: Formal — state order issued
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: October 1, 2022 – December 31, 2022Rule: Stage 2 DBPREnforcement: Formal — state order issued
TIER 2Resolved
Failed treatment technique requirements
When: September 1, 2022 – September 30, 2022Rule: Surface Water Treatment RuleEnforcement: Formal — state order issued
TIER 1 — URGENTResolved
Violation related to Nitrate
When: May 1, 2021 – May 31, 2021Rule: Surface Water Treatment 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
Frequently Asked Questions About BLACKWELL MUNICIPAL AUTHORITY
Is BLACKWELL MUNICIPAL AUTHORITY water safe to drink?
BLACKWELL MUNICIPAL AUTHORITY water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 73 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has BLACKWELL MUNICIPAL AUTHORITY detected?
51 contaminants were tested in BLACKWELL MUNICIPAL AUTHORITY's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does BLACKWELL MUNICIPAL AUTHORITY have any EPA violations?
Yes, BLACKWELL MUNICIPAL AUTHORITY has 73 EPA violation(s) on record, with the most recent in 2025. Violation types include TT, MR, MCL. 46 are health-based violations.
How many people does BLACKWELL MUNICIPAL AUTHORITY serve?
BLACKWELL MUNICIPAL AUTHORITY serves approximately 7,668 people, Oklahoma.
What type of water does BLACKWELL MUNICIPAL AUTHORITY provide?
BLACKWELL MUNICIPAL AUTHORITY 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 OK1021101.
How does BLACKWELL MUNICIPAL AUTHORITY compare to other utilities in Oklahoma?
BLACKWELL MUNICIPAL AUTHORITY 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.