Highlands Ranch Water Supply District

ZipCheckup's reading of EPA SDWIS for Highlands Ranch Water Supply District (CO0118015): no EPA violations recorded in the last five years. In every reporting cycle over the past five years, Highlands Ranch Water Supply District has come through without a single EPA violation - a consistent performance across the full service population of approximately 103,444 residents that reflects both well-maintained infrastructure and reliable operational oversight.

Data: EPA SDWIS

System Overview

Highlands Ranch Water Supply District (EPA ID: CO0118015) is a community water system in Colorado that serves approximately 103,444 people from surface water sources.

This system provides water to 7 ZIP codes across 3 communities.

ZIP-Area Home Safety Context: C (67/100)

This is the average Home Safety Score for 3 of 7 service-area ZIP codes with all required score domains observed. It is not a grade for the water utility.

Model 4.0.0 uses SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the score.

Violation History

Lead & Copper

EPA Lead and Copper Rule evidence attributed directly to this water system:

No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.

Radon Risk in Service Area

Dominant radon zone for ZIP codes served by this system: Zone 1 (High Risk)

The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.

ZIP Codes Served

Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by CO or modeled from parcel and building-footprint data.

• 80120 - Littleton
• 80124 - Lone Tree
• 80125 - Littleton
• 80126 - Littleton
• 80129 - Littleton
• 80130 - Littleton
• 80135 - Sedalia

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Highlands Ranch Water Supply District (CO0118015) on EPA.gov.

Frequently Asked Questions

Is Highlands Ranch Water Supply District water safe to drink?

The accepted 2026Q2 ECHO snapshot contains zero violation records for Highlands Ranch Water Supply District in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.

How many people does Highlands Ranch Water Supply District serve?

Highlands Ranch Water Supply District serves approximately 103,444 people across 7 ZIP codes in Colorado.

Where does Highlands Ranch Water Supply District get its water?

The primary water source is surface water.

@misc{zipcheckup-water-system-co0118015,
  author = {{ZipCheckup}},
  title  = {{Highlands Ranch Water Supply District: Serves 103K People}},
  year   = {n.d.},
  url    = {https://zipcheckup.com/water-system/co0118015/}
}