Water Quality in ANTONITO, CO (81120)

EPA violation data for public water systems serving ZIP code 81120.

149

Total Violations

Health-Based

122

Monitoring / Reporting

141

Resolved

What does this mean?

141 of 149 violations have been resolved. 27 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 122 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: 18 Population served: 3,137

Violations Detail (149 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Chlorine	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	Eye and nose irritation; stomach discomfort
Chlorine	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	Eye and nose irritation; stomach discomfort
Chlorine	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	Eye and nose irritation; stomach discomfort
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2025	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2025	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2025	Active	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Jun 10, 2025	Active	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Jun 10, 2025	Active	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Jun 10, 2025	Active	N/A
Public Notice	Monitoring	N/A	N/A	May 31, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	May 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2025	Resolved	N/A
Chlorine	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	Eye and nose irritation; stomach discomfort
Chlorine	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	Eye and nose irritation; stomach discomfort
Chlorine	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	Eye and nose irritation; stomach discomfort
Surface Water Treatment Rule	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	N/A
Cadmium	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	Kidney damage
Cadmium	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	Kidney damage
Cadmium	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	Kidney damage
Public Notice	Monitoring	N/A	N/A	Nov 14, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Nov 14, 2024	Resolved	N/A
Cadmium	Monitoring	N/A	N/A	Sep 30, 2024	Resolved	Kidney damage
Cadmium	Monitoring	N/A	N/A	Sep 30, 2024	Resolved	Kidney damage
Cadmium	Monitoring	N/A	N/A	Sep 30, 2024	Resolved	Kidney damage
Public Notice	Monitoring	N/A	N/A	Jul 31, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jul 31, 2024	Resolved	N/A
CARBON, TOTAL	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
CARBON, TOTAL	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
CARBON, TOTAL	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
CARBON, TOTAL	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
Cadmium	Health-Based	N/A	0.008	Jun 30, 2024	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.008	Jun 30, 2024	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.008	Jun 30, 2024	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.008	Jun 30, 2024	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.008	Jun 30, 2024	Resolved	Kidney damage
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 10, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 10, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 10, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2024	Resolved	N/A
Chlorine	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	Eye and nose irritation; stomach discomfort
Cadmium	Health-Based	N/A	0.009	Mar 31, 2024	Resolved	Kidney damage
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Chlorine	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	Eye and nose irritation; stomach discomfort
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Chlorine	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	Eye and nose irritation; stomach discomfort
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Cadmium	Health-Based	N/A	0.009	Mar 31, 2024	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.009	Mar 31, 2024	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.009	Mar 31, 2024	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.009	Mar 31, 2024	Resolved	Kidney damage
Public Notice	Monitoring	N/A	N/A	Mar 24, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 24, 2024	Resolved	N/A
CARBON, TOTAL	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
CARBON, TOTAL	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
CARBON, TOTAL	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
CARBON, TOTAL	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Cadmium	Health-Based	N/A	0.008	Dec 31, 2023	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.008	Dec 31, 2023	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.008	Dec 31, 2023	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.008	Dec 31, 2023	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.008	Dec 31, 2023	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.00733	Sep 30, 2023	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.00733	Sep 30, 2023	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.00733	Sep 30, 2023	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.00733	Sep 30, 2023	Resolved	Kidney damage
Cadmium	Health-Based	N/A	0.00733	Sep 30, 2023	Resolved	Kidney damage
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2023	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2023	Active	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
E. COLI	Monitoring	0	N/A	Jul 31, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Jul 31, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Jul 31, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Chlorine	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	Eye and nose irritation; stomach discomfort
Chlorine	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	Eye and nose irritation; stomach discomfort
Chlorine	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	Eye and nose irritation; stomach discomfort
Chlorine	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	Eye and nose irritation; stomach discomfort
CARBON, TOTAL	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
CARBON, TOTAL	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
CARBON, TOTAL	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
CARBON, TOTAL	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Cadmium	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	Kidney damage
Cadmium	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	Kidney damage
Cadmium	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	Kidney damage
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 28, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 28, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 28, 2023	Resolved	N/A
E. COLI	Monitoring	0	N/A	May 31, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	May 31, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	May 31, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Interim Enhanced Surface Water Treatment Rule	Monitoring	N/A	N/A	Nov 30, 2022	Resolved	N/A
Interim Enhanced 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
Interim Enhanced 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
Public Notice	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 10, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 10, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 10, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 10, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Feb 24, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Feb 24, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Feb 24, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Nov 24, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Nov 24, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Nov 24, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	May 1, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	May 1, 2021	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Interim Enhanced Surface Water Treatment Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Interim Enhanced Surface Water Treatment Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Interim Enhanced Surface Water Treatment Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Apr 9, 2021	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Apr 9, 2021	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Apr 9, 2021	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Apr 9, 2021	Resolved	N/A

Lead & Copper Levels

Violation Timeline

2025(20)

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Surface Water Treatment Rule

Jun 30Resolved

Surface Water Treatment Rule

Jun 30Resolved

Surface Water Treatment Rule

Jun 30Resolved

Chlorine

Jun 30Resolved

Chlorine

Jun 30Resolved

Chlorine

Jun 30Resolved

Lead and Copper Rule

Jun 30Active

Lead and Copper Rule

Jun 30Active

Lead and Copper Rule

Jun 30Active

Revised Total Coliform Rule

Jun 10Active

Revised Total Coliform Rule

Jun 10Active

Revised Total Coliform Rule

Jun 10Active

Public Notice

May 31Resolved

Public Notice

May 31Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

2024(48)

Chlorine

Dec 31Resolved

Chlorine

Dec 31Resolved

Chlorine

Dec 31Resolved

Surface Water Treatment Rule

Dec 31Resolved

Surface Water Treatment Rule

Dec 31Resolved

Surface Water Treatment Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Cadmium

Dec 31Resolved

Cadmium

Dec 31Resolved

Cadmium

Dec 31Resolved

Public Notice

Nov 14Resolved

Public Notice

Nov 14Resolved

Cadmium

Sep 30Resolved

Cadmium

Sep 30Resolved

Cadmium

Sep 30Resolved

Public Notice

Jul 31Resolved

Public Notice

Jul 31Resolved

CARBON, TOTAL

Jun 30Resolved

CARBON, TOTAL

Jun 30Resolved

CARBON, TOTAL

Jun 30Resolved

CARBON, TOTAL

Jun 30Resolved

Cadmium

Jun 30Resolved

Cadmium

Jun 30Resolved

Cadmium

Jun 30Resolved

Cadmium

Jun 30Resolved

Cadmium

Jun 30Resolved

Revised Total Coliform Rule

Jun 10Resolved

Revised Total Coliform Rule

Jun 10Resolved

Revised Total Coliform Rule

Jun 10Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Chlorine

Mar 31Resolved

Cadmium

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Chlorine

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Chlorine

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Cadmium

Mar 31Resolved

Cadmium

Mar 31Resolved

Cadmium

Mar 31Resolved

Cadmium

Mar 31Resolved

Public Notice

Mar 24Resolved

Public Notice

Mar 24Resolved

How Does This Compare?

ANTONITO (81120) has 149 recorded violations, including 27 health-based. 8 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.

Water Quality in ANTONITO, CO (81120)

What does this mean?

Violations Detail (149 total)

Lead & Copper Levels

Violation Timeline

2025(20)

2024(48)

2023(44)

2022(19)

2021(18)

How Does This Compare?

Recommended Water Filters

Reverse Osmosis System

Activated Carbon Filter

UV Water Purifier

Nearby ZIP Codes

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