Water Quality in LITTLETON, CO (80120)

EPA violation data for public water systems serving ZIP code 80120.

177

Total Violations

9

Health-Based

168

Monitoring / Reporting

172

Resolved

What does this mean?

172 of 177 violations have been resolved. 9 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 168 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: 23 Population served: 8,741

Violations Detail (177 total)

ContaminantCategoryMCL LimitMeasuredDateStatusHealth Effects
Public NoticeMonitoringN/AN/AJul 25, 2025ResolvedN/A
Public NoticeMonitoringN/AN/AJul 25, 2025ResolvedN/A
Lead and Copper RuleMonitoringN/AN/AJun 30, 2025ActiveN/A
Lead and Copper RuleMonitoringN/AN/AJun 30, 2025ActiveN/A
Revised Total Coliform RuleMonitoringN/AN/AJun 24, 2025ResolvedN/A
Revised Total Coliform RuleMonitoringN/AN/AJun 24, 2025ResolvedN/A
Revised Total Coliform RuleMonitoringN/AN/AJun 24, 2025ResolvedN/A
Public NoticeMonitoringN/AN/AMay 14, 2025ResolvedN/A
Public NoticeMonitoringN/AN/AMay 14, 2025ResolvedN/A
Public NoticeMonitoringN/AN/AJan 1, 2025ResolvedN/A

Lead & Copper Levels

Violation Timeline

2025(11)

Public Notice

76

Jul 25Resolved

Public Notice

76

Jul 25Resolved

Lead and Copper Rule

52

Jun 30Active

Lead and Copper Rule

52

Jun 30Active

Revised Total Coliform Rule

5A

Jun 24Resolved

Revised Total Coliform Rule

5A

Jun 24Resolved

Revised Total Coliform Rule

5A

Jun 24Resolved

Public Notice

75

May 14Resolved

Public Notice

75

May 14Resolved

Public Notice

75

Jan 1Resolved

Public Notice

75

Jan 1Resolved

2024(83)

Revised Total Coliform Rule

3A

Dec 31Resolved

Revised Total Coliform Rule

3A

Dec 31Resolved

Revised Total Coliform Rule

3A

Dec 31Resolved

Stage 1 Disinfectants and Disinfection Byproducts Rule

12

Nov 12Resolved

Stage 1 Disinfectants and Disinfection Byproducts Rule

12

Nov 12Resolved

Stage 1 Disinfectants and Disinfection Byproducts Rule

12

Nov 12Resolved

Stage 1 Disinfectants and Disinfection Byproducts Rule

12

Nov 12Resolved

Surface Water Treatment Rule

36

Oct 31Resolved

Surface Water Treatment Rule

36

Oct 31Resolved

Surface Water Treatment Rule

36

Oct 31Resolved

Surface Water Treatment Rule

36

Oct 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

3A

Oct 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

3A

Oct 31Resolved

Surface Water Treatment Rule

36

Oct 31Resolved

Surface Water Treatment Rule

36

Oct 31Resolved

Surface Water Treatment Rule

36

Oct 31Resolved

Surface Water Treatment Rule

36

Oct 31Resolved

LEAD AND COPPER RULE REVISIONS

4G

Oct 16Resolved

LEAD AND COPPER RULE REVISIONS

4G

Oct 16Resolved

LEAD AND COPPER RULE REVISIONS

4G

Oct 16Resolved

LEAD AND COPPER RULE REVISIONS

4G

Oct 16Resolved

LEAD AND COPPER RULE REVISIONS

2E

Oct 16Resolved

LEAD AND COPPER RULE REVISIONS

2E

Oct 16Resolved

LEAD AND COPPER RULE REVISIONS

2E

Oct 16Resolved

LEAD AND COPPER RULE REVISIONS

2E

Oct 16Resolved

Revised Total Coliform Rule

3A

Sep 30Resolved

Chlorine

27

Sep 30Resolved

Chlorine

27

Sep 30Resolved

Chlorine

27

Sep 30Resolved

TTHM

27

Sep 30Resolved

TTHM

27

Sep 30Resolved

TTHM

27

Sep 30Resolved

TTHM

27

Sep 30Resolved

Total Haloacetic Acids (HAA5)

27

Sep 30Resolved

Revised Total Coliform Rule

3A

Sep 30Resolved

Revised Total Coliform Rule

3A

Sep 30Resolved

Revised Total Coliform Rule

3A

Sep 30Resolved

Chloramine

27

Sep 30Resolved

Chloramine

27

Sep 30Resolved

Chloramine

27

Sep 30Resolved

Chloramine

27

Sep 30Resolved

Surface Water Treatment Rule

36

Sep 30Resolved

Surface Water Treatment Rule

36

Sep 30Resolved

Surface Water Treatment Rule

36

Sep 30Resolved

Surface Water Treatment Rule

36

Sep 30Resolved

Chlorine

27

Sep 30Resolved

Total Haloacetic Acids (HAA5)

27

Sep 30Resolved

Total Haloacetic Acids (HAA5)

27

Sep 30Resolved

Total Haloacetic Acids (HAA5)

27

Sep 30Resolved

Revised Total Coliform Rule

3A

Sep 30Resolved

Revised Total Coliform Rule

3A

Sep 30Resolved

Surface Water Treatment Rule

36

Sep 30Resolved

Surface Water Treatment Rule

36

Sep 30Resolved

Surface Water Treatment Rule

36

Sep 30Resolved

Revised Total Coliform Rule

3A

Sep 30Resolved

Chlorine

27

Sep 30Resolved

Chlorine

27

Sep 30Resolved

Chlorine

27

Sep 30Resolved

Chlorine

27

Sep 30Resolved

TTHM

27

Sep 30Resolved

TTHM

27

Sep 30Resolved

TTHM

27

Sep 30Resolved

TTHM

27

Sep 30Resolved

Total Haloacetic Acids (HAA5)

27

Sep 30Resolved

Total Haloacetic Acids (HAA5)

27

Sep 30Resolved

Total Haloacetic Acids (HAA5)

27

Sep 30Resolved

Total Haloacetic Acids (HAA5)

27

Sep 30Resolved

Lead and Copper Rule

52

Sep 30Active

Lead and Copper Rule

52

Sep 30Active

Revised Total Coliform Rule

3A

Jul 31Resolved

Revised Total Coliform Rule

3A

Jul 31Resolved

Revised Total Coliform Rule

3A

Jul 31Resolved

Chlorine

27

Jun 30Resolved

Chlorine

27

Jun 30Resolved

Chlorine

27

Jun 30Resolved

Public Notice

76

May 22Resolved

Public Notice

76

May 22Resolved

How Does This Compare?

LITTLETON (80120) has 177 recorded violations, including 9 health-based. 5 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.

Nearby ZIP Codes

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