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Transient Non-Community Water System · PWS CO0207115

Alpine Brook WS

Niwot, Colorado 80544 - drinking water served from surface water sources to 100 people, tracked in EPA SDWIS and UCMR5.

100
People served
236
EPA violations
91
Health-based
Untested
UCMR5 result

The verdict

EPA records 236 drinking-water violations at Alpine Brook WS, 39% of them health-based - above the Colorado per-system average.

236
Total EPA violations on record
39%
Health-based (MCL / treatment failure)
100
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Alpine Brook WS

Alpine Brook WS is a private-owned transient non-community water system that delivers drinking water to 100 residents in Niwot, Colorado (Boulder County) through 42 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 236 total violations for this system , of which 91 (39%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 109 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 80 violations (TT, health-based). 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, 37 of 163 UCMR5-tested systems have reported PFAS detections (22.7%).

Alpine Brook WS's 236 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
100
Total Violations
236
Health-Based Violations
91
Water Source
Surface Water

System Details

System Type
Transient Non-Community
Owner Type
Private
Connections
42
County
Boulder
School/Daycare
No
MCL Violations
0
Monitoring Violations
109
Treatment Tech Violations
91

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule TT 80 2022
Surface Water Treatment Rule MR 48 2024
Public Notice Other 32 2022
Interim Enhanced Surface Water Treatment Rule MR 21 2024
Coliform (TCR) MR 17 2015
Revised Total Coliform Rule MON 11 2023
Groundwater Rule TT 7 2018
Nitrate MR 6 2021
Revised Total Coliform Rule TT 4 2017
E. COLI MR 3 2018
Long Term 2 Enhanced Surface Water Treatment Rule MR 3 2008
Revised Total Coliform Rule Other 3 2017

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 Alpine Brook WS.

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 CO0207115 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 Alpine Brook WS 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
2024 Surface Water Treatment Rule MR 48 SDWIS / CO0207115 / 0200
2024 Interim Enhanced Surface Water Treatment Rule MR 21 SDWIS / CO0207115 / 0300
2023 Revised Total Coliform Rule MON 11 SDWIS / CO0207115 / 8000
2022 Surface Water Treatment Rule TT 80 SDWIS / CO0207115 / 0200
2022 Public Notice Other 32 SDWIS / CO0207115 / 7500
2021 Nitrate MR 6 SDWIS / CO0207115 / 1040
2018 Groundwater Rule TT 7 SDWIS / CO0207115 / 0700
2018 E. COLI MR 3 SDWIS / CO0207115 / 3014
2017 Revised Total Coliform Rule TT 4 SDWIS / CO0207115 / 8000
2017 Revised Total Coliform Rule Other 3 SDWIS / CO0207115 / 8000
2015 Coliform (TCR) MR 17 SDWIS / CO0207115 / 3100
2008 Long Term 2 Enhanced Surface Water Treatment Rule MR 3 SDWIS / CO0207115 / 0800

How Alpine Brook WS Compares

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

Metric Alpine Brook WS Colorado avg Federal benchmark
Total violations 236 108.9 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 91 13.9 Indicates a contaminant exceeded a federal MCL
PFAS detection None 22.7% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 100 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 Alpine Brook WS water safe to drink? ▼
Alpine Brook WS (PWS ID: CO0207115) has 236 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 100 people using Surface Water sources.
How many people does Alpine Brook WS serve? ▼
Alpine Brook WS serves 100 people in Niwot, Colorado. It is a Private-owned system using Surface Water water sources with 42 service connections.
What type of violations does Alpine Brook WS have? ▼
Alpine Brook WS has 236 total violations: 91 health-based violations (MCL exceedances or treatment failures), 109 monitoring/reporting violations, and 91 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Alpine Brook WS water? ▼
No PFAS testing data is available for Alpine Brook WS under the EPA's UCMR5 monitoring program.
What water source does Alpine Brook WS use? ▼
Alpine Brook WS uses Surface Water 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.