PlainWater
States → Colorado

Community Water System · PWS CO0107115

Allenspark WSD

Allenspark, Colorado 80510 - drinking water served from surface water sources to 340 people, tracked in EPA SDWIS and UCMR5.

340
People served
352
EPA violations
11
Health-based
Untested
UCMR5 result

The verdict

EPA records 352 drinking-water violations at Allenspark WSD, 3% of them health-based - above the Colorado per-system average.

352
Total EPA violations on record
3%
Health-based (MCL / treatment failure)
340
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Allenspark WSD

Allenspark WSD is a local-owned community water system that delivers drinking water to 340 residents in Allenspark, Colorado (Boulder County) through 122 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 352 total violations for this system , of which 11 (3%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 317 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 30 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%).

Allenspark WSD's 352 violations sit above 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
340
Total Violations
352
Health-Based Violations
11
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
122
County
Boulder
School/Daycare
No
MCL Violations
0
Monitoring Violations
317
Treatment Tech Violations
11

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule MR 30 2022
Chlorine MR 25 2022
Lead and Copper Rule MR 21 2020
Public Notice Other 20 2021
E. COLI MR 15 2009
Interim Enhanced Surface Water Treatment Rule MR 15 2017
Coliform (TCR) MR 11 2007
TTHM MR 10 2010
Arsenic MR 8 2006
Barium MR 8 2006
Cadmium MR 8 2006
Antimony, Total MR 8 2006
Chromium MR 8 2006
Thallium, Total MR 8 2006
Mercury MR 8 2006
Beryllium, Total MR 8 2006
Selenium MR 8 2006
Groundwater Rule TT 8 2020
Ethylbenzene MR 7 2008
Total Haloacetic Acids (HAA5) MR 7 2007
Nitrate MR 5 2006
Nickel MR 5 2006
Fluoride MR 5 2006
1,2,4-Trichlorobenzene MR 4 2002
cis-1,2-Dichloroethylene MR 4 2002
Xylenes, Total MR 4 2002
DICHLOROMETHANE MR 4 2002
trans-1,2-Dichloroethylene MR 4 2002
1,2-Dichloroethane MR 4 2002
1,1,1-Trichloroethane MR 4 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 Allenspark WSD.

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 CO0107115 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 Allenspark WSD 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
2022 Surface Water Treatment Rule MR 30 SDWIS / CO0107115 / 0200
2022 Chlorine MR 25 SDWIS / CO0107115 / 0999
2022 Revised Total Coliform Rule MON 3 SDWIS / CO0107115 / 8000
2021 Public Notice Other 20 SDWIS / CO0107115 / 7500
2020 Lead and Copper Rule MR 21 SDWIS / CO0107115 / 5000
2020 Groundwater Rule TT 8 SDWIS / CO0107115 / 0700
2017 Interim Enhanced Surface Water Treatment Rule MR 15 SDWIS / CO0107115 / 0300
2017 Surface Water Treatment Rule TT 3 SDWIS / CO0107115 / 0200
2016 Pentachlorophenol MR 3 SDWIS / CO0107115 / 2326
2010 TTHM MR 10 SDWIS / CO0107115 / 2950
2009 E. COLI MR 15 SDWIS / CO0107115 / 3014
2008 Ethylbenzene MR 7 SDWIS / CO0107115 / 2992
2007 Coliform (TCR) MR 11 SDWIS / CO0107115 / 3100
2007 Total Haloacetic Acids (HAA5) MR 7 SDWIS / CO0107115 / 2456
2006 Arsenic MR 8 SDWIS / CO0107115 / 1005

How Allenspark WSD Compares

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

Metric Allenspark WSD Colorado avg Federal benchmark
Total violations 352 108.9 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 11 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 340 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 Allenspark WSD water safe to drink? ▼
Allenspark WSD (PWS ID: CO0107115) has 352 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 340 people using Surface Water sources.
How many people does Allenspark WSD serve? ▼
Allenspark WSD serves 340 people in Allenspark, Colorado. It is a Local-owned system using Surface Water water sources with 122 service connections.
What type of violations does Allenspark WSD have? ▼
Allenspark WSD has 352 total violations: 11 health-based violations (MCL exceedances or treatment failures), 317 monitoring/reporting violations, and 11 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Allenspark WSD water? ▼
No PFAS testing data is available for Allenspark WSD under the EPA's UCMR5 monitoring program.
What water source does Allenspark WSD use? ▼
Allenspark WSD uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
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.