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Cromwell, OK Tap Water Quality 2026

Water quality report for Cromwell, OK — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Cromwell's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Seminole Co. Rw&swmd #3 PWSID: OK3006703 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. PFAS has never been sampled at this system.

B

Cromwell earns a B for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: not detected
PFAS never sampled at this system
34 violations since 2015, 30 health-based
No violations currently open
Cromwell's lead level vs. all Oklahoma community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of Oklahoma utilities
Population Served
230
~296 connections
Water Source
Surface water
Purchased from another system — SDWIS source code SWP
Active Violations
0
34 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
Action level: 15 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.089 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.088 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.102 MG/L 0.080 mg/L 2025 Archived
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Resolved
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2024 Resolved
TTHM MCL EXCEEDANCE 0.1 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.087 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.087 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.086 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.087 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.082 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.095 MG/L 0.080 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.109 MG/L 0.080 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.126 MG/L 0.080 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.118 MG/L 0.080 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.109 MG/L 0.080 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.104 MG/L 0.080 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.091 MG/L 0.080 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.096 MG/L 0.080 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.099 MG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.09 MG/L 0.080 mg/L 2020 Archived
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2020 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2020 Resolved
TTHM MCL EXCEEDANCE 0.085 MG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.085 MG/L 0.080 mg/L 2019 Archived
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 0.084 MG/L 0.080 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.087 MG/L 0.080 mg/L 2017 Archived
TTHM MCL EXCEEDANCE 0.091 MG/L 0.080 mg/L 2017 Archived
TTHM MCL EXCEEDANCE 0.094 MG/L 0.080 mg/L 2016 Archived
TTHM MCL EXCEEDANCE 0.108 MG/L 0.080 mg/L 2016 Archived
TTHM MCL EXCEEDANCE 0.1 MG/L 0.080 mg/L 2015 Archived
TTHM MCL EXCEEDANCE 0.084 MG/L 0.080 mg/L 2015 Archived
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

34 violations are on record since 2015, of which 30 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Seminole Co. Rw&Swmd #3
PWSID OK3006703
Water source Surface water — Purchased from another system — SDWIS source code SWP
Population served 230
Service connections 296
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Cromwell tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Cromwell water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Cromwell? ▼
Seminole Co. Rw&Swmd #3 (PWSID OK3006703). Surface water. Purchased from another system — SDWIS source code SWP
When was this system last inspected? ▼
It was last inspected on 2025-11-10. No significant deficiencies were recorded.

What Should Cromwell Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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