Water Quality in RONAN, MT (59864)

EPA violation data for public water systems serving ZIP code 59864.

170

Total Violations

4

Health-Based

166

Monitoring / Reporting

168

Resolved

What does this mean?

168 of 170 violations have been resolved. 4 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 166 are monitoring or reporting violations (missed testing deadlines or late paperwork — not necessarily a water quality issue). Not all violations mean your water is unsafe. The EPA requires reporting even for minor administrative issues.

Water systems: 13 Population served: 4,078

Violations Detail (170 total)

ContaminantCategoryMCL LimitMeasuredDateStatusHealth Effects
E. COLIMonitoring0N/ANov 12, 2025ActiveSevere gastrointestinal illness; may be fatal in vulnerable populations
E. COLIMonitoring0N/ANov 12, 2025ActiveSevere gastrointestinal illness; may be fatal in vulnerable populations
E. COLIMonitoring0N/AAug 18, 2025ResolvedSevere gastrointestinal illness; may be fatal in vulnerable populations
E. COLIMonitoring0N/AAug 18, 2025ResolvedSevere gastrointestinal illness; may be fatal in vulnerable populations
E. COLIMonitoring0N/AAug 18, 2025ResolvedSevere gastrointestinal illness; may be fatal in vulnerable populations
E. COLIMonitoring0N/AAug 13, 2025ResolvedSevere gastrointestinal illness; may be fatal in vulnerable populations
E. COLIMonitoring0N/AAug 13, 2025ResolvedSevere gastrointestinal illness; may be fatal in vulnerable populations
E. COLIMonitoring0N/AAug 13, 2025ResolvedSevere gastrointestinal illness; may be fatal in vulnerable populations
Surface Water Treatment RuleMonitoringN/AN/AMar 31, 2025ResolvedN/A
Surface Water Treatment RuleMonitoringN/AN/AMar 31, 2025ResolvedN/A

Lead & Copper Levels

Violation Timeline

2025(64)

E. COLI

34

Nov 12Active

E. COLI

34

Nov 12Active

E. COLI

34

Aug 18Resolved

E. COLI

34

Aug 18Resolved

E. COLI

34

Aug 18Resolved

E. COLI

34

Aug 13Resolved

E. COLI

34

Aug 13Resolved

E. COLI

34

Aug 13Resolved

Surface Water Treatment Rule

36

Mar 31Resolved

Surface Water Treatment Rule

36

Mar 31Resolved

Surface Water Treatment Rule

36

Mar 31Resolved

Carbon tetrachloride

03

Mar 31Resolved

DICHLOROMETHANE

03

Mar 31Resolved

Endothall

03

Mar 31Resolved

p-Dichlorobenzene

03

Mar 31Resolved

Benzo(a)pyrene

03

Mar 31Resolved

LASSO

03

Mar 31Resolved

cis-1,2-Dichloroethylene

03

Mar 31Resolved

Atrazine

03

Mar 31Resolved

Benzene

03

Mar 31Resolved

Di(2-ethylhexyl) adipate

03

Mar 31Resolved

OXAMYL

03

Mar 31Resolved

Simazine

03

Mar 31Resolved

Di(2-ethylhexyl) phthalate

03

Mar 31Resolved

Toxaphene

03

Mar 31Resolved

Hexachlorocyclopentadiene

03

Mar 31Resolved

Endrin

03

Mar 31Resolved

Heptachlor

03

Mar 31Resolved

HEXACHLOROBENZENE

03

Mar 31Resolved

Pentachlorophenol

03

Mar 31Resolved

Total Polychlorinated Biphenyls (PCB)

03

Mar 31Resolved

ETHYLENE DIBROMIDE

03

Mar 31Resolved

1,2,4-Trichlorobenzene

03

Mar 31Resolved

o-Dichlorobenzene

03

Mar 31Resolved

1,1-Dichloroethylene

03

Mar 31Resolved

trans-1,2-Dichloroethylene

03

Mar 31Resolved

1,2-Dichloroethane

03

Mar 31Resolved

1,1,1-Trichloroethane

03

Mar 31Resolved

1,1,2-Trichloroethane

03

Mar 31Resolved

CHLOROBENZENE

03

Mar 31Resolved

Styrene

03

Mar 31Resolved

Dalapon

03

Mar 31Resolved

Tetrachloroethylene

03

Mar 31Resolved

2,4-D

03

Mar 31Resolved

Carbofuran

03

Mar 31Resolved

2,4,5-TP

03

Mar 31Resolved

Ethylbenzene

03

Mar 31Resolved

Heptachlor epoxide

03

Mar 31Resolved

Diquat

03

Mar 31Resolved

Chlordane

03

Mar 31Resolved

1,2-Dichloropropane

03

Mar 31Resolved

Toluene

03

Mar 31Resolved

Trichloroethylene

03

Mar 31Resolved

1,2-DIBROMO-3-CHLOROPROPANE

03

Mar 31Resolved

Xylenes, Total

03

Mar 31Resolved

Methoxychlor

03

Mar 31Resolved

Vinyl chloride

03

Mar 31Resolved

Glyphosate

03

Mar 31Resolved

Picloram

03

Mar 31Resolved

BHC-GAMMA

03

Mar 31Resolved

Dinoseb

03

Mar 31Resolved

Revised Total Coliform Rule

3A

Jan 31Resolved

Revised Total Coliform Rule

3A

Jan 31Resolved

Revised Total Coliform Rule

3A

Jan 31Resolved

2024(11)

Asbestos

03

Dec 31Resolved

Revised Total Coliform Rule

3A

Oct 31Resolved

Revised Total Coliform Rule

3A

Oct 31Resolved

Revised Total Coliform Rule

3A

Oct 31Resolved

Revised Total Coliform Rule

1A

Jun 30Resolved

Revised Total Coliform Rule

1A

Jun 30Resolved

Revised Total Coliform Rule

1A

Jun 30Resolved

Revised Total Coliform Rule

1A

Jun 30Resolved

Surface Water Treatment Rule

36

Feb 29Resolved

Surface Water Treatment Rule

36

Feb 29Resolved

Surface Water Treatment Rule

36

Feb 29Resolved

How Does This Compare?

RONAN (59864) has 170 recorded violations, including 4 health-based. 2 remain unresolved. Consider testing your tap water independently for added peace of mind.

Recommended Water Filters

Based on the contaminants detected in your area, these filter types may help improve your water quality.

Reverse Osmosis System

Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.

Targets:Lead, Copper, Arsenic, Mercury, Cadmium

Look for:NSF/ANSI 58 certified

NSF Certified Products → EPA Safe Drinking Water Guide →

UV Water Purifier

Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.

Targets:E. coli, Coliform, Giardia, Cryptosporidium

Look for:NSF/ANSI 55 (Class A) certified

NSF Certified Products → EPA Safe Drinking Water Guide →

Always look for filters certified by NSF International for the specific contaminants you want to remove.

Nearby ZIP Codes

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