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Is Thornton, CO tap water safe?

15 utilities serve Thornton, by EPA’s records. Here is what EPA’s and Colorado’s records show for each, against the legal limits and the stricter health goals.

Matched to your utility using EPA records.

The short answer

7 of the 15 utilities serving Thornton have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Colorado’s records: North Washington Street WSD, County of Broomfield City and, Kimberly Hills MHP and 4 more.

City of Thornton, which serves the most people here, has 2 results above EPA’s new limit, which takes effect in 2029, 2 results above the health goal and 1 result above EPA’s health benchmark. The worst: PFOA at 7.1 ppt, above EPA’s new limit, which takes effect in 2029.

A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Thornton’s ZIP codes, from EPA’s estimates.

5 more utilities in Thornton

By EPA’s estimate, each serves fewer people in Thornton than those above.

  • City of Westminsterserves 202,078 people · about 480 in Thornton · no health-based violations since 2016
  • Friendly Village of the Rockiesserves 1,046 people · about 430 in Thornton · 1 health-based violation since 2016
  • The Grove at Alta Ridgeserves 1,300 people · about 220 in Thornton · 1 health-based violation since 2016
  • Avilla Eastlakeserves 410 people · lists Thornton among the places it serves · 1 health-based violation since 2016
  • Chaparral Village MHPserves 303 people · lists Thornton among the places it serves · no health-based violations since 2016

What handles it

Each of these is certified, on a certifier’s listing, for a result above a line in City of Thornton’s water, which serves the most people here. Another utility’s report names what handles its own results.

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Every claim, and more filters, in the full report

Water testing near Thornton

A utility tests the water it sends out. A test of your own tap shows what your pipes add, and on a private well it is the only test there is. It takes a lab Colorado certifies.

The 3 labs Colorado certifies closest to Thornton, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Murray-Brown Laboratories, LLC.

    Northglenn, CO · about 1 mile

    Certified for bacteria

  • Colorado Analytical Laboratory - Commerce City

    Commerce City, CO · about 5 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, PFAS, radioactivity

  • SGS North America, Inc. - Denver

    Denver, CO · about 11 miles

    Certified for nitrate, lead and copper, metals, minerals and other inorganics

All 54 certified labs for Colorado

ZIP codes in Thornton

Which ZIP codes are in Thornton: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: CDPHE certified drinking water laboratories; distances from the Census 2020 ZIP code tabulation area gazetteer.

Near Thornton

Other towns in Adams County with a page of their own.

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