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Community Water System · PWS CO0159120

Tanglewood WS

Silverthorne, Colorado 80498 - drinking water served from groundwater sources to 60 people, tracked in EPA SDWIS and UCMR5.

60
People served
79
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 79 drinking-water violations at Tanglewood WS - below the Colorado per-system average.

79
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
60
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Tanglewood WS

Tanglewood WS is a private-owned community water system that delivers drinking water to 60 residents in Silverthorne, Colorado (Summit County) through 23 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 79 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 63 monitoring and reporting violations are on file. The most recent violation on record dates to 2008.

The most frequently cited contaminant at this system is Chlorine, recorded in 24 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%).

Tanglewood WS's 79 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
60
Total Violations
79
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
23
County
Summit
School/Daycare
No
MCL Violations
0
Monitoring Violations
63
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Chlorine MR 24 2007
Coliform (TCR) MR 18 2006
Consumer Confidence Rule Other 9 2007
Nitrate MR 6 2006
Di(2-ethylhexyl) phthalate MR 6 2007
TTHM MR 3 2006
Combined Uranium MR 3 2008
Total Haloacetic Acids (HAA5) MR 3 2006

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 Tanglewood 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 CO0159120 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 Tanglewood 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
2008 Combined Uranium MR 3 SDWIS / CO0159120 / 4006
2007 Chlorine MR 24 SDWIS / CO0159120 / 0999
2007 Consumer Confidence Rule Other 9 SDWIS / CO0159120 / 7000
2007 Di(2-ethylhexyl) phthalate MR 6 SDWIS / CO0159120 / 2039
2006 Coliform (TCR) MR 18 SDWIS / CO0159120 / 3100
2006 Nitrate MR 6 SDWIS / CO0159120 / 1040
2006 TTHM MR 3 SDWIS / CO0159120 / 2950
2006 Total Haloacetic Acids (HAA5) MR 3 SDWIS / CO0159120 / 2456

How Tanglewood WS Compares

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

Metric Tanglewood WS Colorado avg Federal benchmark
Total violations 79 108.9 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 60 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 Tanglewood WS water safe to drink? ▼
Tanglewood WS (PWS ID: CO0159120) has 79 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 60 people using Groundwater sources.
How many people does Tanglewood WS serve? ▼
Tanglewood WS serves 60 people in Silverthorne, Colorado. It is a Private-owned system using Groundwater water sources with 23 service connections.
What type of violations does Tanglewood WS have? ▼
Tanglewood WS has 79 total violations: 0 health-based violations (MCL exceedances or treatment failures), 63 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Tanglewood WS water? ▼
No PFAS testing data is available for Tanglewood WS under the EPA's UCMR5 monitoring program.
What water source does Tanglewood WS use? ▼
Tanglewood WS uses Groundwater 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.