Is Louisville, CO tap water safe?
The short answer
3 of the 4 utilities serving Louisville have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Colorado’s records: City of Louisville, Superior MD No 1 and County of Broomfield City and.
City of Louisville, which serves the most people here, has nothing above a health goal in EPA’s and Colorado’s records. That data covers what its report lists, not everything.
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 Louisville’s ZIP codes, from EPA’s estimates.
- Open report
City of Louisville
Colorado · serves 20,975 people · about 8,300 in Louisville
Nothing in its records is above a health goal.
2 health-based violations since 2016
- Open report
Superior MD No 1
Colorado · serves 17,900 people · about 5,200 in Louisville
Nothing in its records is above a health goal.
2 health-based violations since 2016
- Open report
City of Lafayette
Colorado · serves 28,700 people · about 200 in Louisville
1 result above the health goal. The worst: Lead at 2.0 ppb, above the health goal.
No health-based violations since 2016
- Open report
County of Broomfield City and
Colorado · serves 106,153 people · about 150 in Louisville
2 results above the health goal. The worst: Lead at 2.5 ppb, above the health goal.
2 health-based violations since 2016
Water testing near Louisville
The 3 labs Colorado certifies closest to Louisville, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Hazen Research
Golden, CO · about 11 miles
Certified for nitrate, lead and copper, metals, minerals and other inorganics, radioactivity
Eurofins Denver
Arvada, CO · about 11 miles
Certified for nitrate, minerals and other inorganics, organic chemicals, PFAS
Eurofins Reservoirs Environmental, Inc.
Arvada, CO · about 11 miles
Certified for bacteria
ZIP codes in Louisville
Which ZIP codes are in Louisville: 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 Louisville
Other towns in Boulder County with a page of their own.
What to do next
- Read City of Louisville’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- Decide if you want a filter at allA filter for taste or chlorine is a preference, not a need. The standards say what each kind can do.NSF/ANSI standards, decoded
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water