EPA SDWIS ~155K water systems EPA + UCMR5

1,2-DIBROMO-3-CHLOROPROPANE

Compiled by PlainWater Editorial, Drinking Water Quality Editorial Team · May 15, 2026

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

PlainWater home → About this data

EPA contaminant code: 2931

Total Violations

36,389

Systems Affected

6,889

Health-Based %

Most Affected State

What this means

1,2-DIBROMO-3-CHLOROPROPANE appears in EPA SDWIS with 36,389 recorded violations across 6,889 public water systems. Of those, 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

1,2-DIBROMO-3-CHLOROPROPANE violations broken down by EPA classification.

Health-based (1%) Monitoring/Reporting (99%)

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
Salem Heights Estate	PA	156	62
Congregation Ohr Menachem	PA	148	30
Skyview Estates	IL	124	56
Prague	OK	111	2,395
Stillwater Water District 1	NJ	93	1,200
27 Maple Drive	CT	88	38
Aqua PA Sun Valley	PA	79	120
Neshaminy Manor Center	PA	74	2,100
Christ Mission Lutheran Church	IL	70	150
Country Corner Mobile Home Park	WA	68	95
Indian Creek Valley Water Auth	PA	66	7,000
Save a Pet	IL	64	50
Oilton	OK	64	1,435
Seneca Trail Christian Academy	WV	64	100
Congregation Beth Judea	IL	62	25
Criswell Court MHP	IL	60	94
Ambler Boro Water Dept	PA	60	20,000
Paradise Stream Resor	PA	60	774
PA American Audubon	PA	57	8,200
Taleem Ul Haq	IL	56	100
Willow Springs MHP	IN	56	25
Oro Valley Water Utility	AZ	55	42,316
Tempo Lake Water Co	WA	54	246
Plymouth Community Church	IN	53	90
350 Sparta Complex	NJ	53	316
Payson Town Of	AZ	52	17,682
Pbc Linear	IL	52	140
Tower Springs LLC	PA	52	25
Patton Village West Water System	TX	50	1,457
Boley Tool and Machine Works	IL	49	100

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 1,2-DIBROMO-3-CHLOROPROPANE in drinking water? ▼

1,2-DIBROMO-3-CHLOROPROPANE is a contaminant tracked by the EPA under the Safe Drinking Water Act. It has caused 36,389 violations across 6,889 public water systems nationwide. 1% of these violations are health-based, meaning the contaminant exceeded Maximum Contaminant Levels (MCLs) or treatment technique requirements.

How many water systems have 1,2-DIBROMO-3-CHLOROPROPANE violations? ▼

6,889 public water systems across the United States have at least one 1,2-DIBROMO-3-CHLOROPROPANE violation recorded in the EPA SDWIS database.

Are 1,2-DIBROMO-3-CHLOROPROPANE violations dangerous? ▼

1% of 1,2-DIBROMO-3-CHLOROPROPANE 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 1,2-DIBROMO-3-CHLOROPROPANE 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.

Browse all → | Rankings →

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.