Town of Antonito☆

Where the water comes from

Facility	Kind	Water
WELL NO 1	Well	Groundwater
INFILTRATION GALLERY NO 1	Well	Groundwater under the influence of surface water

These are EPA's facility records, not DWR structures. Which decreed rights sit behind an intake is the next phase; nothing here is inferred.

DWR structures that name this system

Source Probable join · fetched 2026-09-09 · matched on DWR's recorded contact or an EPA intake name; verify on the dossier

No DWR structure on file records this system as its contact, and none of its EPA intakes matches a structure name in its districts. DWR records a contact on only a fraction of structures, and only for districts fetched from its live service, so this is absence of a record, not evidence of no rights.

Compliance record

Source Register of another agency · fetched 2026-09-09 · verify at EPA ECHO ↗

EPA's own summary: violations in 7 of the last 12 quarters. In violation for, in EPA's words: 0200=Surface Water Treatment Rule; 0999=Chlorine; 2920=CARBON, TOTAL; 8000=Revised Total Coliform Rule. Currently: 2920=CARBON, TOTAL.

What happened

All 10 violation records on file, grouped into the 6 distinct things EPA's codes describe. Dates are the compliance period the violation is filed against.

Every violation record, as filed (10 of 10)

Compliance period	What	About	Kind	Status	Measured
2019-07-01	OCCT/SOWT Study/Recommendation	Lead and Copper Rule	health-based	returned to compliance (2020-09-30)
2018-05-01 – 2018-05-31	Treatment Technique (SWTR and GWR)	SWTR	health-based	returned to compliance (2018-08-09)
2018-04-25	Treatment Technique No Certif. Operator	DBP Stage 1	health-based	returned to compliance (2018-08-17)
2018-04-01 – 2018-04-30	Monthly Turbidity Exceed (Enhanced SWTR)	Ieswtr	health-based	returned to compliance (2018-08-09)
2018-04-01 – 2018-04-30	Treatment Technique (SWTR and GWR)	SWTR	health-based	returned to compliance (2018-08-09)
2018-02-11	Failure To Address Deficiency	Groundwater Rule	health-based	returned to compliance (2018-08-01)
2017-09-13	Treatment Technique No Certif. Operator	DBP Stage 1	health-based	returned to compliance (2018-01-01)
2016-11-01	Treatment Technique No Certif. Operator	DBP Stage 1	health-based	returned to compliance (2016-12-05)
2015-08-01	Failure to Filter (SWTR)	SWTR	health-based	returned to compliance (2017-03-01)
2012-03-23	Failure To Address Deficiency	Groundwater Rule	health-based	returned to compliance (2013-12-31)

What the regulator did about it

151 enforcement actions on this system's federal record. In Colorado the state is the primacy agency, so most actions are the state's; EPA acts directly on tribal systems and when it steps in.

20 most recent of 151; the rest are on the ECHO report.

Lead and copper

The latest 90th-percentile lead result is 0.005 mg/L (sampling period ending 2025-12-31) against an action level of 0.015 mg/L, below it. Copper 4.83 mg/L against 1.3 mg/L, above it. 14 results on file.

The action level is not a health limit: it is the level at which the rule requires a system to act (corrosion control, public education, and in some cases replacing lead service lines). Lead mostly enters water from household plumbing, so a system-wide percentile does not tell you what comes out of one tap.

Violation, enforcement and lead/copper records are EPA SDWIS federal reporting, fetched monthly; the summary is EPA ECHO. Code names come from EPA's own REF_CODE_VALUE table. SDWIS carries violations, not routine sample results — nitrate, disinfection by-product and PFAS values are not in it, and a clean record here means nothing was reported as a violation, not that nothing was ever detected. For what was measured, ask the system for its Consumer Confidence Report.

PFAS and lithium: EPA's UCMR 5 monitoring, 2023–2025

Source Register of another agency · fetched 2026-09-09 · verify at EPA UCMR occurrence data ↗

5 samples, 120 results, 2024-02-12 to 2024-11-05. No PFAS was detected at the reporting limits; lithium was not detected.

Rows shown: every detected contaminant plus the regulated PFAS and lithium; the rest were below their reporting limits. These are UCMR monitoring samples, not compliance samples. EPA's April 2024 rule set 4.0 ng/L (0.004 µg/L) for PFOA and PFOS, the same as UCMR 5's reporting limit, so any detection of either is at or above it; the rule's compliance date and its other limits have been under revision since 2025 and are not applied here. State PFAS sampling is on CDPHE's pages ↗.

Common questions

Who provides drinking water in Antonito, Colorado?

The Town of Antonito is the public water system serving 981 people in Conejos County, from groundwater under the influence of surface water. Its EPA public water system id is CO0111100.

Where does the Town of Antonito get its water?

The Town of Antonito reports groundwater under the influence of surface water as its primary source. EPA lists its source facilities as WELL NO 1, INFILTRATION GALLERY NO 1.

Does the Town of Antonito have any drinking water violations?

EPA's compliance record shows no open health-based violations for the Town of Antonito at the last monthly fetch. Older and non-health-based entries, if any, are listed on this page.