Little Thompson Water District

ZipCheckup's reading of EPA SDWIS for Little Thompson Water District (CO0135477): no EPA violations recorded in the last five years. Water monitoring for Little Thompson Water District: clean, five years, 25,654 residents.

Data: EPA SDWIS

System Overview

Little Thompson Water District (EPA ID: CO0135477) is a community water system in Colorado that serves approximately 25,654 people from surface water sources.

This system provides water to 11 ZIP codes across 9 communities.

ZIP-Area Home Safety Context: D (42/100)

This is the average Home Safety Score for 1 of 11 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

No reported lead measurement appears for this PWSID in the accepted LCR snapshot. Absence of a reported measurement is not a measured zero.

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.

• 80503 - Longmont
• 80513 - Berthoud
• 80526 - Fort Collins
• 80528 - Fort Collins
• 80534 - Johnstown
• 80537 - Loveland
• 80538 - Loveland
• 80542 - Mead
• 80543 - Milliken
• 80634 - Greeley
• 80651 - Platteville

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Little Thompson Water District (CO0135477) on EPA.gov.

Frequently Asked Questions

Is Little Thompson Water District water safe to drink?

The accepted 2026Q2 ECHO snapshot contains zero violation records for Little Thompson Water 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 Little Thompson Water District serve?

Little Thompson Water District serves approximately 25,654 people across 11 ZIP codes in Colorado.

Where does Little Thompson Water District get its water?

The primary water source is surface water.

@misc{zipcheckup-water-system-co0135477,
  author = {{ZipCheckup}},
  title  = {{Little Thompson Water District, CO: Serves 26K People}},
  year   = {n.d.},
  url    = {https://zipcheckup.com/water-system/co0135477/}
}