Water Quality in BILLINGS, MT (59101)

EPA violation data for public water systems serving ZIP code 59101.

247

Total Violations

37

Health-Based

210

Monitoring / Reporting

245

Resolved

What does this mean?

245 of 247 violations have been resolved. 37 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 210 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: 100 Population served: 137,533

Violations Detail (247 total)

ContaminantCategoryMCL LimitMeasuredDateStatusHealth Effects
Consumer Confidence RuleMonitoringN/AN/ASep 30, 2025ActiveN/A
Revised Total Coliform RuleMonitoringN/AN/AAug 31, 2025ResolvedN/A
Revised Total Coliform RuleMonitoringN/AN/AAug 31, 2025ResolvedN/A
Revised Total Coliform RuleMonitoringN/AN/AAug 31, 2025ResolvedN/A
Lead and Copper RuleMonitoringN/AN/AJun 30, 2025ResolvedN/A
Lead and Copper RuleMonitoringN/AN/AJun 30, 2025ResolvedN/A
Lead and Copper RuleMonitoringN/AN/AJun 30, 2025ResolvedN/A
Revised Total Coliform RuleHealth-BasedN/AN/AJun 30, 2025ResolvedN/A
Revised Total Coliform RuleHealth-BasedN/AN/AJun 30, 2025ResolvedN/A
Revised Total Coliform RuleHealth-BasedN/AN/AJun 30, 2025ResolvedN/A

Lead & Copper Levels

Violation Timeline

2025(91)

Consumer Confidence Rule

72

Sep 30Active

Revised Total Coliform Rule

3A

Aug 31Resolved

Revised Total Coliform Rule

3A

Aug 31Resolved

Revised Total Coliform Rule

3A

Aug 31Resolved

Lead and Copper Rule

51

Jun 30Resolved

Lead and Copper Rule

51

Jun 30Resolved

Lead and Copper Rule

51

Jun 30Resolved

Revised Total Coliform Rule

2A

Jun 30Resolved

Revised Total Coliform Rule

2A

Jun 30Resolved

Revised Total Coliform Rule

2A

Jun 30Resolved

Consumer Confidence Rule

71

Jun 30Active

Consumer Confidence Rule

71

Jun 30Resolved

Consumer Confidence Rule

71

Jun 30Resolved

Carbofuran

03

Jun 30Resolved

Chlordane

03

Jun 30Resolved

OXAMYL

03

Jun 30Resolved

HEXACHLOROBENZENE

03

Jun 30Resolved

HEXACHLOROBENZENE

03

Jun 30Resolved

HEXACHLOROBENZENE

03

Jun 30Resolved

Methoxychlor

03

Jun 30Resolved

Methoxychlor

03

Jun 30Resolved

Methoxychlor

03

Jun 30Resolved

Toxaphene

03

Jun 30Resolved

Toxaphene

03

Jun 30Resolved

Toxaphene

03

Jun 30Resolved

Dalapon

03

Jun 30Resolved

Dalapon

03

Jun 30Resolved

Dalapon

03

Jun 30Resolved

Di(2-ethylhexyl) adipate

03

Jun 30Resolved

Di(2-ethylhexyl) adipate

03

Jun 30Resolved

Di(2-ethylhexyl) adipate

03

Jun 30Resolved

Di(2-ethylhexyl) phthalate

03

Jun 30Resolved

Di(2-ethylhexyl) phthalate

03

Jun 30Resolved

OXAMYL

03

Jun 30Resolved

Hexachlorocyclopentadiene

03

Jun 30Resolved

Hexachlorocyclopentadiene

03

Jun 30Resolved

Hexachlorocyclopentadiene

03

Jun 30Resolved

LASSO

03

Jun 30Resolved

LASSO

03

Jun 30Resolved

LASSO

03

Jun 30Resolved

Heptachlor

03

Jun 30Resolved

Heptachlor

03

Jun 30Resolved

Heptachlor

03

Jun 30Resolved

Heptachlor epoxide

03

Jun 30Resolved

Heptachlor epoxide

03

Jun 30Resolved

Heptachlor epoxide

03

Jun 30Resolved

2,4-D

03

Jun 30Resolved

2,4-D

03

Jun 30Resolved

2,4-D

03

Jun 30Resolved

2,4,5-TP

03

Jun 30Resolved

2,4,5-TP

03

Jun 30Resolved

2,4,5-TP

03

Jun 30Resolved

Pentachlorophenol

03

Jun 30Resolved

Pentachlorophenol

03

Jun 30Resolved

Pentachlorophenol

03

Jun 30Resolved

Endrin

03

Jun 30Resolved

Benzo(a)pyrene

03

Jun 30Resolved

Benzo(a)pyrene

03

Jun 30Resolved

Carbofuran

03

Jun 30Resolved

OXAMYL

03

Jun 30Resolved

Carbofuran

03

Jun 30Resolved

Revised Total Coliform Rule

3A

Jun 30Resolved

Revised Total Coliform Rule

3A

Jun 30Resolved

Revised Total Coliform Rule

3A

Jun 30Resolved

BHC-GAMMA

03

Jun 30Resolved

BHC-GAMMA

03

Jun 30Resolved

BHC-GAMMA

03

Jun 30Resolved

Dinoseb

03

Jun 30Resolved

Dinoseb

03

Jun 30Resolved

Dinoseb

03

Jun 30Resolved

Endrin

03

Jun 30Resolved

Endrin

03

Jun 30Resolved

Benzo(a)pyrene

03

Jun 30Resolved

Simazine

03

Jun 30Resolved

Simazine

03

Jun 30Resolved

Simazine

03

Jun 30Resolved

Picloram

03

Jun 30Resolved

Picloram

03

Jun 30Resolved

Picloram

03

Jun 30Resolved

Atrazine

03

Jun 30Resolved

Atrazine

03

Jun 30Resolved

Atrazine

03

Jun 30Resolved

Chlordane

03

Jun 30Resolved

Chlordane

03

Jun 30Resolved

Di(2-ethylhexyl) phthalate

03

Jun 30Resolved

Revised Total Coliform Rule

3A

May 31Resolved

Revised Total Coliform Rule

3A

May 31Resolved

Revised Total Coliform Rule

3A

May 31Resolved

Revised Total Coliform Rule

3A

Apr 30Resolved

Revised Total Coliform Rule

3A

Apr 30Resolved

Revised Total Coliform Rule

3A

Apr 30Resolved

2024(41)

Nitrate-Nitrite

01

Dec 31Resolved

Nitrate-Nitrite

01

Dec 31Resolved

Nitrate-Nitrite

01

Dec 31Resolved

Nitrate-Nitrite

01

Dec 31Resolved

Lead and Copper Rule

66

Dec 29Resolved

Lead and Copper Rule

66

Dec 29Resolved

Lead and Copper Rule

66

Dec 29Resolved

Lead and Copper Rule

66

Dec 29Resolved

Lead and Copper Rule

66

Dec 29Resolved

Lead and Copper Rule

66

Dec 29Resolved

Lead and Copper Rule

66

Dec 29Resolved

Lead and Copper Rule

66

Dec 29Resolved

Revised Total Coliform Rule

3A

Nov 30Resolved

Revised Total Coliform Rule

3A

Nov 30Resolved

Revised Total Coliform Rule

3A

Nov 30Resolved

Lead and Copper Rule

52

Sep 30Resolved

Lead and Copper Rule

52

Sep 30Resolved

Lead and Copper Rule

52

Sep 30Resolved

Nitrate-Nitrite

01

Sep 30Resolved

Nitrate-Nitrite

01

Sep 30Resolved

Nitrate-Nitrite

01

Sep 30Resolved

Nitrate-Nitrite

01

Sep 30Resolved

Nitrate-Nitrite

01

Sep 30Resolved

Lead and Copper Rule

52

Sep 30Resolved

Lead and Copper Rule

52

Sep 30Resolved

Lead and Copper Rule

52

Sep 30Resolved

Lead and Copper Rule

52

Sep 30Resolved

Lead and Copper Rule

52

Sep 30Resolved

Lead and Copper Rule

52

Sep 30Resolved

Revised Total Coliform Rule

3A

Aug 31Resolved

Revised Total Coliform Rule

3A

Aug 31Resolved

Consumer Confidence Rule

71

Jun 30Resolved

Consumer Confidence Rule

71

Jun 30Resolved

Nitrate-Nitrite

01

Mar 31Resolved

Nitrate-Nitrite

01

Mar 31Resolved

Nitrate-Nitrite

01

Mar 31Resolved

Nitrate-Nitrite

01

Mar 31Resolved

Nitrate-Nitrite

01

Mar 31Resolved

Revised Total Coliform Rule

3A

Jan 31Resolved

Revised Total Coliform Rule

3A

Jan 31Resolved

Revised Total Coliform Rule

3A

Jan 31Resolved

How Does This Compare?

BILLINGS (59101) has 247 recorded violations, including 37 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 →

Activated Carbon Filter

Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.

Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor

Look for:NSF/ANSI 42 & 53 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.

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