EPA SDWIS ~155K water systems EPA + UCMR5

2,4-D

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.

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EPA contaminant code: 2105

Total Violations

49,369

Systems Affected

9,509

Health-Based %

Most Affected State

What this means

2,4-D appears in EPA SDWIS with 49,369 recorded violations across 9,509 public water systems. Of those, 0% 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

2,4-D violations broken down by EPA classification.

Health-based (0%) Monitoring/Reporting (100%)

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
Pinnacle Water Association	WV	188	85
Salem Heights Estate	PA	156	62
Coal Mountain Water	WV	149	80
Congregation Ohr Menachem	PA	148	30
Skyview Estates	IL	124	56
Prague	OK	111	2,395
Frankfort Psd	WV	100	6,747
27 Maple Drive	CT	88	38
Aqua PA Sun Valley	PA	80	120
Neshaminy Manor Center	PA	77	2,100
Springhill Park Subdivision	MT	72	90
Christ Mission Lutheran Church	IL	70	150
PA American Audubon	PA	70	8,200
Nwwa Warrington Township	PA	68	21,588
Willow Springs MHP	IN	67	25
Helena RV and Mobile Home Park	MT	66	250
Paradise Stream Resor	PA	65	774
Oilton	OK	64	1,435
Bridge Creek School	OK	64	800
Seneca Trail Christian Academy	WV	64	100
Malta City Of	MT	63	1,800
Congregation Beth Judea	IL	62	25
Save a Pet	IL	61	50
Ambler Boro Water Dept	PA	60	20,000
Indian Creek Valley Water Auth	PA	58	7,000
Taleem Ul Haq	IL	56	100
Roamingwood Sewer and Water	PA	56	3,775
Tooele City Water System	UT	56	37,100
Plymouth Community Church	IN	53	90
Pbc Linear	IL	52	140

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 2,4-D in drinking water? ▼

2,4-D is a contaminant tracked by the EPA under the Safe Drinking Water Act. It has caused 49,369 violations across 9,509 public water systems nationwide. 0% of these violations are health-based, meaning the contaminant exceeded Maximum Contaminant Levels (MCLs) or treatment technique requirements.

How many water systems have 2,4-D violations? ▼

9,509 public water systems across the United States have at least one 2,4-D violation recorded in the EPA SDWIS database.

Are 2,4-D violations dangerous? ▼

0% of 2,4-D 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 2,4-D 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.

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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.