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EPA SDWIS ~155K water systems EPA + UCMR5

Long Term 2 Enhanced Surface Water Treatment 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: 0800

Total Violations
9,010
Systems Affected
871
Health-Based %
83.6%
Most Affected State
-

What this means

Long Term 2 Enhanced Surface Water Treatment Rule appears in EPA SDWIS with 9,010 recorded violations across 871 public water systems. Of those, 83.6% 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

Long Term 2 Enhanced Surface Water Treatment Rule violations broken down by EPA classification.

Health-based (83.6%) Monitoring/Reporting (16.400000000000006%)

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
Cassie Water System TX 495 106
Specht Store TX 288 170
Barksdale WSC TX 283 279
Gypsy River Resort TX 263 87
Confluence Boro Muni Auth PA 262 645
Jicarilla Dulce 06 252 3,064
Denton Town Of MT 232 255
Seven Hills Ranch TX 231 801
Duchman Family Winery TX 188 55
Camp Eagle TX 185 850
Geo Specialty Chemicals TX 184 46
Webb County Water Utilities TX 173 8,358
Crystal Clear Sud TX 144 20,766
Luquillo Urbano PR 135 8,880
River Road Camp TX 129 180
Deerfield MI 128 943
City of Groesbeck TX 112 4,250
Alto Frio Baptist Encampment TX 110 750
Wagoner Co. RWD #4 OK 108 25,792
D Bar B Mobile Home Ranch TX 104 267
Lake Erie Utilities Company OH 90 400
Nowata Municipal Authority OK 78 3,971
Criders on the Frio TX 74 100
City of Pflugerville TX 73 63,464
Poplar Bluff PWS MO 72 17,043
Nowata Municipal Authority OK 72 3,971
Metlakatla 10 66 1,575
Las Bocas PR 65 10,998
Kickapoo Tribal Waterworks 07 62 520
Cubuy Maizales PR 59 617

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 Long Term 2 Enhanced Surface Water Treatment Rule in drinking water? ▼
Long Term 2 Enhanced Surface Water Treatment Rule is a contaminant tracked by the EPA under the Safe Drinking Water Act. It has caused 9,010 violations across 871 public water systems nationwide. 83.6% of these violations are health-based, meaning the contaminant exceeded Maximum Contaminant Levels (MCLs) or treatment technique requirements.
How many water systems have Long Term 2 Enhanced Surface Water Treatment Rule violations? ▼
871 public water systems across the United States have at least one Long Term 2 Enhanced Surface Water Treatment Rule violation recorded in the EPA SDWIS database.
Are Long Term 2 Enhanced Surface Water Treatment Rule violations dangerous? ▼
83.6% of Long Term 2 Enhanced Surface Water Treatment 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 Long Term 2 Enhanced Surface Water Treatment 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.