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EPA SDWIS ~155K water systems EPA + UCMR5

Fluoride

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: 1025

Total Violations
78,347
Systems Affected
13,411
Health-Based %
36.1%
Most Affected State
-

What this means

Fluoride appears in EPA SDWIS with 78,347 recorded violations across 13,411 public water systems. Of those, 36.1% 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

Fluoride violations broken down by EPA classification.

Health-based (36.1%) Monitoring/Reporting (63.9%)

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
City of Wolfforth TX 1,090 9,600
Deer Run VA 954 104
Rescue Waterworks VA 897 203
City of Seagraves TX 786 2,417
Seven Estates TX 778 189
Plott Acres TX 732 204
Three Springs Farm OK 730 89
Stormlight Mobile Home Park TX 606 76
City of Wellman TX 593 200
City of Smyer TX 539 474
City of Opdyke West TX 490 220
City of New Home TX 479 965
Seven Estates TX 476 189
Borden County Water System TX 474 275
Willing Workers Club VA 473 31
114th Street Mobile Home Park TX 445 42
Lordsburg Water Supply System NM 441 3,213
Cswr Southwest Garden Water TX 436 324
City of Ropesville TX 423 434
Town North Estates TX 412 216
Whitharral WSC TX 410 200
City of Plains TX 395 1,355
San Simon Dwid AZ 387 312
Grassland WSC TX 387 55
Cox Addition Water System TX 381 114
Howard Water Coop TX 371 117
Terrells Mobile Home Park TX 364 60
Loop WSC TX 360 300
City of Andrews TX 339 14,109
Sdm Water Association AR 301 520

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 Fluoride in drinking water? ▼
Fluoride is a contaminant tracked by the EPA under the Safe Drinking Water Act. It has caused 78,347 violations across 13,411 public water systems nationwide. 36.1% of these violations are health-based, meaning the contaminant exceeded Maximum Contaminant Levels (MCLs) or treatment technique requirements.
How many water systems have Fluoride violations? ▼
13,411 public water systems across the United States have at least one Fluoride violation recorded in the EPA SDWIS database.
Are Fluoride violations dangerous? ▼
36.1% of Fluoride 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 Fluoride 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.