Colorado · population 146,689
Lead pipes in Thornton, CO
No lead lines reported
Most of Thornton (population 146,689) gets its water from City of Thornton, which reported 43,826 service lines and no lead, galvanized or unknown lines.
0% of City of Thornton's service lines are lead or galvanized requiring replacement, lower than the Colorado average (1.2%) and lower than the national average (3.1%).
- Lead 0%
- Galvanized (replace) 0%
- Unknown 0%
- Non-lead 100%
Latest lead test for City of Thornton (2025): 2.3 ppb at the 90th percentile, against a 15 ppb federal action level. Full test history.
Compliance record: EPA lists 1 Lead and Copper Rule violation since 2015 for City of Thornton.
Water systems serving Thornton
| Water system | Lead | Galv. | Unknown | % lead |
|---|---|---|---|---|
| City of ThorntonMain system | 0 | 0 | 0 | 0% |
| Woodland Hills MHCAlso serves parts of the city | 0 | 0 | 0 | 0% |
| Redwood EstatesAlso serves parts of the city | 0 | 0 | 0 | 0% |
| The Grove at Alta RidgeAlso serves parts of the city | 0 | 0 | 0 | 0% |
| City of NorthglennServes nearby areas | 0 | 0 | 0 | 0% |
Matched from EPA water system service area boundaries and the cities each system reports serving. Edges of the city may be served by a neighboring system; your water bill names your utility.
Check your address in Thornton
The counts above cover the whole water system. To see whether your line is lead, look up your address on City of Thornton's official inventory. Utilities had to make these public by October 16, 2024.
No map yet? Do the 2-minute scratch and magnet test.
Protect your drinking water
If your line is lead, galvanized or unknown, use a filter certified to NSF/ANSI 53 for lead for drinking, cooking and baby formula, and use only cold water.
Choosing a lead-certified filter · Testing your water · Replacement cost
Nearby cities
- Northglennno lead reported
- Federal Heightsno lead reported
- Broomfieldno lead reported
- Westminster1 lead + galv. lines
- Commerceno lead reported
- Erieno lead reported
- Lafayette31 lead + galv. lines
- Daconono lead reported
Check another water system
Questions
Does Thornton, CO have lead pipes?
City of Thornton, which serves Thornton, reported no lead, galvanized or unknown service lines.
Who supplies water to Thornton?
EPA's service area maps place most of Thornton in City of Thornton's service area (PWSID CO0101150). Woodland Hills MHC, Redwood Estates, The Grove at Alta Ridge, City of Northglenn also serve parts of the city or nearby areas.
How do I check whether my Thornton home has a lead service line?
Search your address on City of Thornton's service line inventory map. You can also scratch the pipe where water enters your home: lead is soft, dull gray, scratches to shiny silver and doesn't attract a magnet.
When will lead pipes in Thornton be replaced?
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask City of Thornton whether your street is scheduled and whether it covers the private side.