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Transient Non-Community Water System · PWS CO0134860

Vallecito Valley Subd

Bayfield, Colorado 81122 - drinking water served from groundwater sources to 143 people, tracked in EPA SDWIS and UCMR5.

143
People served
41
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 41 drinking-water violations at Vallecito Valley Subd - below the Colorado per-system average.

41
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
143
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Vallecito Valley Subd

Vallecito Valley Subd is a private-owned transient non-community water system that delivers drinking water to 143 residents in Bayfield, Colorado (La Plata County) through 75 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 41 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 34 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 13 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Colorado, EPA tracks 2,193 public water systems serving 7,473,456 people, with 238,796 cumulative violations and 30,589 health-based violations on record. About 93% of systems in the state carry at least one violation, and state-wide the average per system is 108.9 violations. Statewide, 98 of 163 UCMR5-tested systems have reported PFAS detections (60.1%).

Vallecito Valley Subd's 41 violations sit below the Colorado average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
143
Total Violations
41
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Transient Non-Community
Owner Type
Private
Connections
75
County
La Plata
School/Daycare
No
MCL Violations
0
Monitoring Violations
34
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 13 2009
Coliform (TCR) MR 9 2002
Nitrate MR 6 2008
Surface Water Treatment Rule MR 3 2020
Revised Total Coliform Rule MON 3 2020
Consumer Confidence Rule Other 2 2002

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Vallecito Valley Subd.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID CO0134860 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Colorado Drinking Water Authority

Colorado Department of Public Health and Environment, Water Quality Control is the primacy agency that licenses and inspects Vallecito Valley Subd under EPA-delegated authority.

Open CO regulator portal

Source: Colorado Department of Public Health and Environment, Water Quality Control

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2020 Surface Water Treatment Rule MR 3 SDWIS / CO0134860 / 0200
2020 Revised Total Coliform Rule MON 3 SDWIS / CO0134860 / 8000
2009 Lead and Copper Rule MR 13 SDWIS / CO0134860 / 5000
2008 Nitrate MR 6 SDWIS / CO0134860 / 1040
2002 Coliform (TCR) MR 9 SDWIS / CO0134860 / 3100
2002 Consumer Confidence Rule Other 2 SDWIS / CO0134860 / 7000

How Vallecito Valley Subd Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Vallecito Valley Subd Colorado avg Federal benchmark
Total violations 41 108.9 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 13.9 Indicates a contaminant exceeded a federal MCL
PFAS detection None 60.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 143 3,408 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,193 regulated public water systems in Colorado.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Vallecito Valley Subd water safe to drink? ▼
Vallecito Valley Subd (PWS ID: CO0134860) has 41 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 143 people using Groundwater sources.
How many people does Vallecito Valley Subd serve? ▼
Vallecito Valley Subd serves 143 people in Bayfield, Colorado. It is a Private-owned system using Groundwater water sources with 75 service connections.
What type of violations does Vallecito Valley Subd have? ▼
Vallecito Valley Subd has 41 total violations: 0 health-based violations (MCL exceedances or treatment failures), 34 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Vallecito Valley Subd water? ▼
No PFAS testing data is available for Vallecito Valley Subd under the EPA's UCMR5 monitoring program.
What water source does Vallecito Valley Subd use? ▼
Vallecito Valley Subd uses Groundwater as its primary water source. It is classified as a Transient Non-Community Water System, serving transient populations.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.