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Community Water System · PWS CO0134717

Southwest Horizon Ranch

Durango, Colorado 81303 - drinking water served from groundwater sources to 323 people, tracked in EPA SDWIS and UCMR5.

323
People served
791
EPA violations
3
Health-based
Untested
UCMR5 result

The verdict

EPA records 791 drinking-water violations at Southwest Horizon Ranch - above the Colorado per-system average.

791
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
323
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Southwest Horizon Ranch

Southwest Horizon Ranch is a private-owned community water system that delivers drinking water to 323 residents in Durango, Colorado (La Plata County) through 60 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 791 total violations for this system , of which 3 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 783 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 Combined Radium (-226 and -228), recorded in 17 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%).

Southwest Horizon Ranch's 791 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
323
Total Violations
791
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
60
County
La Plata
School/Daycare
No
MCL Violations
3
Monitoring Violations
783
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Radium (-226 and -228) MR 17 2015
DICHLOROMETHANE MR 14 2015
o-Dichlorobenzene MR 14 2015
1,1-Dichloroethylene MR 14 2015
Carbon tetrachloride MR 14 2015
1,2-Dichloropropane MR 14 2015
Trichloroethylene MR 14 2015
Tetrachloroethylene MR 14 2015
CHLOROBENZENE MR 14 2015
Toluene MR 14 2015
Styrene MR 14 2015
Xylenes, Total MR 14 2015
p-Dichlorobenzene MR 14 2015
Vinyl chloride MR 14 2015
trans-1,2-Dichloroethylene MR 14 2015
1,1,1-Trichloroethane MR 14 2015
Benzene MR 14 2015
Ethylbenzene MR 14 2015
1,2-Dichloroethane MR 14 2015
1,1,2-Trichloroethane MR 14 2015
1,2,4-Trichlorobenzene MR 14 2015
cis-1,2-Dichloroethylene MR 14 2015
Lead and Copper Rule MR 11 2008
Barium MR 10 2015
Cadmium MR 10 2015
Chromium MR 10 2015
Mercury MR 10 2015
Nickel MR 10 2015
Antimony, Total MR 10 2015
Beryllium, Total MR 10 2015

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 Southwest Horizon Ranch.

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 CO0134717 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 Southwest Horizon Ranch 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 Revised Total Coliform Rule Other 3 SDWIS / CO0134717 / 8000
2018 Chlorine MR 7 SDWIS / CO0134717 / 0999
2018 Revised Total Coliform Rule MON 3 SDWIS / CO0134717 / 8000
2015 Combined Radium (-226 and -228) MR 17 SDWIS / CO0134717 / 4010
2015 DICHLOROMETHANE MR 14 SDWIS / CO0134717 / 2964
2015 o-Dichlorobenzene MR 14 SDWIS / CO0134717 / 2968
2015 1,1-Dichloroethylene MR 14 SDWIS / CO0134717 / 2977
2015 Carbon tetrachloride MR 14 SDWIS / CO0134717 / 2982
2015 1,2-Dichloropropane MR 14 SDWIS / CO0134717 / 2983
2015 Trichloroethylene MR 14 SDWIS / CO0134717 / 2984
2015 Tetrachloroethylene MR 14 SDWIS / CO0134717 / 2987
2015 CHLOROBENZENE MR 14 SDWIS / CO0134717 / 2989
2015 Toluene MR 14 SDWIS / CO0134717 / 2991
2015 Styrene MR 14 SDWIS / CO0134717 / 2996
2015 Xylenes, Total MR 14 SDWIS / CO0134717 / 2955

How Southwest Horizon Ranch Compares

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

Metric Southwest Horizon Ranch Colorado avg Federal benchmark
Total violations 791 108.9 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 3 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 323 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 Southwest Horizon Ranch water safe to drink? ▼
Southwest Horizon Ranch (PWS ID: CO0134717) has 791 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 323 people using Groundwater sources.
How many people does Southwest Horizon Ranch serve? ▼
Southwest Horizon Ranch serves 323 people in Durango, Colorado. It is a Private-owned system using Groundwater water sources with 60 service connections.
What type of violations does Southwest Horizon Ranch have? ▼
Southwest Horizon Ranch has 791 total violations: 3 health-based violations (MCL exceedances or treatment failures), 783 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Southwest Horizon Ranch water? ▼
No PFAS testing data is available for Southwest Horizon Ranch under the EPA's UCMR5 monitoring program.
What water source does Southwest Horizon Ranch use? ▼
Southwest Horizon Ranch 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.