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EPA SDWIS ~155K water systems EPA + UCMR5

Revised Total Coliform Rule

EPA SDWIS quarterly extract data for this analyte. Detection counts and health-based violation counts reflect the most recent federal release.

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EPA contaminant code: 8000

Total Violations
710,085
Systems Affected
60,574
Health-Based %
9.2%
Most Affected State
-

What this means

Revised Total Coliform Rule appears in EPA SDWIS with 710,085 recorded violations across 60,574 public water systems. Of those, 9.2% are classified as health-based, meaning the reading exceeded a federally enforceable Maximum Contaminant Level or a treatment-technique requirement rather than a monitoring or reporting lapse. Health-based violations are the subset that trigger formal corrective action and public notification, so the share is a useful signal of real-world exposure risk rather than paperwork drift. State-level concentration data is not consistently reported for this contaminant, so regional interpretation should lean on the system table below rather than state aggregates. Utilities listed below are ranked by cumulative violation count, so a higher rank reflects persistence in the record rather than a single spike; readers comparing systems should consider population served alongside violation count to gauge how many households were actually exposed.

Violation Type Split

Revised Total Coliform Rule violations broken down by EPA classification.

Health-based (9.2%) Monitoring/Reporting (90.8%)

Health-based violations indicate the contaminant exceeded an EPA Maximum Contaminant Level (MCL) or treatment-technique requirement; monitoring/reporting violations are procedural.

Most Affected Water Systems

System State Violations Population
Stallion Oilfield Services PA 885 25
Meyers Castle IN 723 25
Orchard View Park NC 517 109
T L Water Jones Acres TX 512 120
Pinon Hills RV Park NM 448 25
Tuck Em Inn PA 442 50
Loma Escondida Water Association NM 429 89
Los Cabritos IN 428 33
Oak Hill Acres Mobile Home Subdivision TX 411 81
Key Road Subdivision Water System TX 390 54
Raccoon Lakeside Lodge IN 389 61
Timber Creek MHP East & West OK 380 40
Longhorn Estates Water System NM 379 264
Church of Troy OH 359 100
Gurleen Petroleum Dba Angel Food IN 352 108
Leroys Mobile Home Park TX 352 60
Route 654 Good to Go PA 351 25
Raton Pass Camp NM 348 35
Hickory Hills Mobile Home Park - Well #2 IN 344 40
Midway Pines RV Park TX 344 132
Lakeview Christian Center IN 334 62
Circle H MHP NC 334 68
Cassandra Water System NM 330 34
Highland Meadows Estates Mdwca NM 329 43
Skywater WSC TX 328 140
Home Church IN 320 129
The Country Mart NY 320 129
Williams Trailer Park TX 307 157
Goshen Family Restaurant IN 306 108
Hill Top Cafe TX 303 300

Drinking Water Guides

Understanding Water Quality Data

What EPA SDWIS tracks, how violations are classified, and what MCLs mean.
PFAS in Drinking Water

What forever chemicals are, EPA testing results, and 2024 standards.
Is My Water Safe?

How to assess your local water quality and when to take precautions.

Frequently Asked Questions

What is Revised Total Coliform Rule in drinking water? ▼
Revised Total Coliform Rule is a contaminant tracked by the EPA under the Safe Drinking Water Act. It has caused 710,085 violations across 60,574 public water systems nationwide. 9.2% of these violations are health-based, meaning the contaminant exceeded Maximum Contaminant Levels (MCLs) or treatment technique requirements.
How many water systems have Revised Total Coliform Rule violations? ▼
60,574 public water systems across the United States have at least one Revised Total Coliform Rule violation recorded in the EPA SDWIS database.
Are Revised Total Coliform Rule violations dangerous? ▼
9.2% of Revised Total Coliform Rule violations are health-based, meaning the contaminant level exceeded safe limits set by the EPA. Health-based violations require corrective action by the water system. Not all violations indicate immediate health risk, but they signal that water quality standards were not met.
Which state has the most Revised Total Coliform Rule violations? ▼
State-level breakdown data is not available for this contaminant.
Where does this contaminant data come from? ▼
All violation data comes from the EPA Safe Drinking Water Information System (SDWIS), which tracks compliance for all public water systems regulated under the Safe Drinking Water Act. SDWIS records violations including Maximum Contaminant Level (MCL) exceedances, treatment technique failures, and monitoring/reporting issues.

Data Sources

Contaminant violation data from the EPA Safe Drinking Water Information System (SDWIS). Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations.

Related

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Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the EPA Safe Drinking Water Information System (SDWIS). Consult a qualified professional before making decisions based on this data.

Read our methodology - how this data is sourced, computed, and verified.

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.