Water Quality in LARKSPUR, CO (80118)

EPA violation data for public water systems serving ZIP code 80118.

125

Total Violations

Health-Based

106

Monitoring / Reporting

125

Resolved

What does this mean?

125 of 125 violations have been resolved. 19 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 106 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: 6 Population served: 4,871

Violations Detail (125 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 30, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Feb 3, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Feb 3, 2024	Resolved	N/A
E. COLI	Monitoring	0	N/A	Oct 31, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Oct 31, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Oct 31, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Combined Radium (-226 and -228)	Health-Based	N/A	6.05	Sep 30, 2023	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	6.05	Sep 30, 2023	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	6.05	Sep 30, 2023	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	6.05	Sep 30, 2023	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	5.88	Jun 30, 2023	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	5.88	Jun 30, 2023	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	5.88	Jun 30, 2023	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	5.88	Jun 30, 2023	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	5.88	Jun 30, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Apr 15, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Apr 15, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Apr 15, 2023	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	6.58	Mar 31, 2023	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	6.58	Mar 31, 2023	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	6.58	Mar 31, 2023	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	6.58	Mar 31, 2023	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	6.58	Mar 31, 2023	Resolved	N/A
Long Term 2 Enhanced Surface Water Treatment Rule	Monitoring	N/A	N/A	Feb 15, 2023	Resolved	N/A
Long Term 2 Enhanced Surface Water Treatment Rule	Monitoring	N/A	N/A	Feb 15, 2023	Resolved	N/A
Long Term 2 Enhanced Surface Water Treatment Rule	Monitoring	N/A	N/A	Feb 15, 2023	Resolved	N/A
DICHLOROMETHANE	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	6.25	Dec 31, 2022	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	6.25	Dec 31, 2022	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	6.25	Dec 31, 2022	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	6.25	Dec 31, 2022	Resolved	N/A
1,2,4-Trichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,2,4-Trichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,2,4-Trichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Xylenes, Total	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Xylenes, Total	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Xylenes, Total	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,1-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,1-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,1-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,2-Dichloroethane	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,2-Dichloroethane	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,2-Dichloroethane	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,1,1-Trichloroethane	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,1,1-Trichloroethane	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,1,1-Trichloroethane	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,2-Dichloropropane	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,2-Dichloropropane	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,2-Dichloropropane	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,1,2-Trichloroethane	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,1,2-Trichloroethane	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
1,1,2-Trichloroethane	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
CHLOROBENZENE	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
CHLOROBENZENE	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
CHLOROBENZENE	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Styrene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Styrene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Styrene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
DICHLOROMETHANE	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Carbon tetrachloride	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Liver problems; increased risk of cancer
cis-1,2-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
cis-1,2-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
cis-1,2-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
o-Dichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
o-Dichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
o-Dichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Benzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Anemia; decrease in blood platelets; increased risk of cancer
Benzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Anemia; decrease in blood platelets; increased risk of cancer
Benzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Anemia; decrease in blood platelets; increased risk of cancer
Ethylbenzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Ethylbenzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Ethylbenzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Vinyl chloride	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Increased risk of cancer
Vinyl chloride	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Increased risk of cancer
Vinyl chloride	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Increased risk of cancer
p-Dichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
p-Dichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
p-Dichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
trans-1,2-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
trans-1,2-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
trans-1,2-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Trichloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Liver problems; increased risk of cancer
Trichloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Liver problems; increased risk of cancer
Trichloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Liver problems; increased risk of cancer
Tetrachloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Liver problems; increased risk of cancer
Tetrachloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Liver problems; increased risk of cancer
Tetrachloroethylene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Liver problems; increased risk of cancer
Carbon tetrachloride	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Liver problems; increased risk of cancer
Toluene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Toluene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Toluene	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
DICHLOROMETHANE	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Combined Radium (-226 and -228)	Health-Based	N/A	6.25	Dec 31, 2022	Resolved	N/A
Carbon tetrachloride	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Liver problems; increased risk of cancer
Surface Water Treatment Rule	Monitoring	N/A	N/A	Nov 30, 2022	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Nov 30, 2022	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Nov 30, 2022	Resolved	N/A
TTHM	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Combined Radium (-226 and -228)	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
TTHM	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
TTHM	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Combined Radium (-226 and -228)	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Combined Radium (-226 and -228)	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Combined Radium (-226 and -228)	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Combined Radium (-226 and -228)	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Combined Radium (-226 and -228)	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Nov 4, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Nov 4, 2021	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Interim Enhanced Surface Water Treatment Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Interim Enhanced Surface Water Treatment Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Interim Enhanced Surface Water Treatment Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Interim Enhanced Surface Water Treatment Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Interim Enhanced Surface Water Treatment Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Interim Enhanced Surface Water Treatment Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A

Lead & Copper Levels

Violation Timeline

2024(5)

Revised Total Coliform Rule

Jul 30Resolved

Revised Total Coliform Rule

Jul 30Resolved

Revised Total Coliform Rule

Jul 30Resolved

Public Notice

Feb 3Resolved

Public Notice

Feb 3Resolved

2023(23)

E. COLI

Oct 31Resolved

E. COLI

Oct 31Resolved

E. COLI

Oct 31Resolved

Combined Radium (-226 and -228)

Sep 30Resolved

Combined Radium (-226 and -228)

Sep 30Resolved

Combined Radium (-226 and -228)

Sep 30Resolved

Combined Radium (-226 and -228)

Sep 30Resolved

Combined Radium (-226 and -228)

Jun 30Resolved

Combined Radium (-226 and -228)

Jun 30Resolved

Combined Radium (-226 and -228)

Jun 30Resolved

Combined Radium (-226 and -228)

Jun 30Resolved

Combined Radium (-226 and -228)

Jun 30Resolved

Public Notice

Apr 15Resolved

Public Notice

Apr 15Resolved

Public Notice

Apr 15Resolved

Combined Radium (-226 and -228)

Mar 31Resolved

Combined Radium (-226 and -228)

Mar 31Resolved

Combined Radium (-226 and -228)

Mar 31Resolved

Combined Radium (-226 and -228)

Mar 31Resolved

Combined Radium (-226 and -228)

Mar 31Resolved

Long Term 2 Enhanced Surface Water Treatment Rule

Feb 15Resolved

Long Term 2 Enhanced Surface Water Treatment Rule

Feb 15Resolved

Long Term 2 Enhanced Surface Water Treatment Rule

Feb 15Resolved

2022(71)

DICHLOROMETHANE

Dec 31Resolved

Combined Radium (-226 and -228)

Dec 31Resolved

Combined Radium (-226 and -228)

Dec 31Resolved

Combined Radium (-226 and -228)

Dec 31Resolved

Combined Radium (-226 and -228)

Dec 31Resolved

1,2,4-Trichlorobenzene

Dec 31Resolved

1,2,4-Trichlorobenzene

Dec 31Resolved

1,2,4-Trichlorobenzene

Dec 31Resolved

Xylenes, Total

Dec 31Resolved

Xylenes, Total

Dec 31Resolved

Xylenes, Total

Dec 31Resolved

1,1-Dichloroethylene

Dec 31Resolved

1,1-Dichloroethylene

Dec 31Resolved

1,1-Dichloroethylene

Dec 31Resolved

1,2-Dichloroethane

Dec 31Resolved

1,2-Dichloroethane

Dec 31Resolved

1,2-Dichloroethane

Dec 31Resolved

1,1,1-Trichloroethane

Dec 31Resolved

1,1,1-Trichloroethane

Dec 31Resolved

1,1,1-Trichloroethane

Dec 31Resolved

1,2-Dichloropropane

Dec 31Resolved

1,2-Dichloropropane

Dec 31Resolved

1,2-Dichloropropane

Dec 31Resolved

1,1,2-Trichloroethane

Dec 31Resolved

1,1,2-Trichloroethane

Dec 31Resolved

1,1,2-Trichloroethane

Dec 31Resolved

CHLOROBENZENE

Dec 31Resolved

CHLOROBENZENE

Dec 31Resolved

CHLOROBENZENE

Dec 31Resolved

Styrene

Dec 31Resolved

Styrene

Dec 31Resolved

Styrene

Dec 31Resolved

DICHLOROMETHANE

Dec 31Resolved

Carbon tetrachloride

Dec 31Resolved

cis-1,2-Dichloroethylene

Dec 31Resolved

cis-1,2-Dichloroethylene

Dec 31Resolved

cis-1,2-Dichloroethylene

Dec 31Resolved

o-Dichlorobenzene

Dec 31Resolved

o-Dichlorobenzene

Dec 31Resolved

o-Dichlorobenzene

Dec 31Resolved

Benzene

Dec 31Resolved

Benzene

Dec 31Resolved

Benzene

Dec 31Resolved

Ethylbenzene

Dec 31Resolved

Ethylbenzene

Dec 31Resolved

Ethylbenzene

Dec 31Resolved

Vinyl chloride

Dec 31Resolved

Vinyl chloride

Dec 31Resolved

Vinyl chloride

Dec 31Resolved

p-Dichlorobenzene

Dec 31Resolved

p-Dichlorobenzene

Dec 31Resolved

p-Dichlorobenzene

Dec 31Resolved

trans-1,2-Dichloroethylene

Dec 31Resolved

trans-1,2-Dichloroethylene

Dec 31Resolved

trans-1,2-Dichloroethylene

Dec 31Resolved

Trichloroethylene

Dec 31Resolved

Trichloroethylene

Dec 31Resolved

Trichloroethylene

Dec 31Resolved

Tetrachloroethylene

Dec 31Resolved

Tetrachloroethylene

Dec 31Resolved

Tetrachloroethylene

Dec 31Resolved

Carbon tetrachloride

Dec 31Resolved

Toluene

Dec 31Resolved

Toluene

Dec 31Resolved

Toluene

Dec 31Resolved

DICHLOROMETHANE

Dec 31Resolved

Combined Radium (-226 and -228)

Dec 31Resolved

Carbon tetrachloride

Dec 31Resolved

Surface Water Treatment Rule

Nov 30Resolved

Surface Water Treatment Rule

Nov 30Resolved

Surface Water Treatment Rule

Nov 30Resolved

How Does This Compare?

LARKSPUR (80118) has 125 recorded violations, including 19 health-based. All violations have been resolved, which is a positive sign for current water quality. 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.

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.

Water Quality in LARKSPUR, CO (80118)

What does this mean?

Violations Detail (125 total)

Lead & Copper Levels

Violation Timeline

2024(5)

2023(23)

2022(71)

2021(26)

How Does This Compare?

Recommended Water Filters

Activated Carbon Filter

UV Water Purifier

Nearby ZIP Codes

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