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EPA SDWIS ~155K water systems EPA + UCMR5

Chloramine

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: 1006

Total Violations
2,449
Systems Affected
310
Health-Based %
5%
Most Affected State
-

What this means

Chloramine appears in EPA SDWIS with 2,449 recorded violations across 310 public water systems. Of those, 5% 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

Chloramine violations broken down by EPA classification.

Health-based (5%) Monitoring/Reporting (95%)

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
Acorn Acres MHP IL 77 52
Forge at the Lake IL 55 387
Forbes City Of ND 49 53
Almont City Of ND 49 122
Ross City Of ND 47 97
Carver Gardens VA 44 163
Nelson Park VA 44 530
Queens Lake System VA 44 1,375
York Terrace System VA 44 755
Longton, City Of KS 32 277
Riverview Heights ND 32 200
Zeigler IL 31 1,774
Regent City Of ND 31 160
Willow Creek North MHP IL 25 250
West River Water and Sewer ND 23 450
Galatia IL 22 989
Menard Correctional Center IL 21 2,950
New Hradec Waterworks ND 21 60
Vergennes IL 20 648
Bowdon City Of ND 20 131
Blm Gw MHP, LLC IL 19 390
Inspire Communities-Springbrook ND 19 300
Golva City Of ND 18 61
Sykeston City Of ND 18 117
Trenton Water Users Assoc ND 18 840
Noonan City Of ND 17 121
Longacre Estates MHP IL 16 375
Nilwood IL 16 1,394
Crainville IL 16 1,711
MA Patout & Son Sugar Mill Water System LA 16 170

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 Chloramine in drinking water? ▼
Chloramine is a contaminant tracked by the EPA under the Safe Drinking Water Act. It has caused 2,449 violations across 310 public water systems nationwide. 5% of these violations are health-based, meaning the contaminant exceeded Maximum Contaminant Levels (MCLs) or treatment technique requirements.
How many water systems have Chloramine violations? ▼
310 public water systems across the United States have at least one Chloramine violation recorded in the EPA SDWIS database.
Are Chloramine violations dangerous? ▼
5% of Chloramine 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 Chloramine 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.