Redwood Estates
What EPA’s and Colorado’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.
- Serves
- 1,500 people
- Connections
- 754
- Water source
- Surface water bought from another system
- Based in
- Thornton, CO
- County
- Adams
- Owner
- Private
- Hardness
- Hard
The ZIP code it serves
The short answer
Nothing in EPA’s and Colorado’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. No health-based violations on file since 2016.
What was found
Total trihalomethanes (TTHM), fluoride and haloacetic acids (HAA5): Colorado’s own results, samples taken from Feb. 23, 2021 to Aug. 21, 2026.
Below EPA’s limits3
Total trihalomethanes (TTHM)
Forms or is added in treatment
40ppb
Highest yearly average, 2021 to 2026
2026 average: 28.1 ppb
Averaged by year, the highest was 40 ppb, in 2023, below EPA’s legal limit of 80 ppb. Its highest single sample was 63.3 ppb. In 2026, the latest year on file, its three samples averaged 28.1 ppb.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
Fluoride
Forms or is added in treatment
0.64ppm
Highest yearly average, 2024
Averaged by year, the highest was 0.64 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. That is the only year on file.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
Haloacetic acids (HAA5)
Forms or is added in treatment
8.7ppb
Highest yearly average, 2021 to 2026
2026 average: 8.2 ppb
Averaged by year, the highest was 8.7 ppb, in 2024, below EPA’s legal limit of 60 ppb. Its highest single sample was 11.7 ppb. In 2026, the latest year on file, its three samples averaged 8.2 ppb.
What handles it
No certification claim covers this compound yet.
One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Lead
Hardness
Hard, typically 165 mg/L (9.6 grains per gallon), across 2 sampling points, in 2024.
Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.
Violations since 2016
No health-based violations on file with EPA since 2016.
What this report can’t tell you
Everything else. Total trihalomethanes (TTHM), fluoride and haloacetic acids (HAA5) results here are Colorado’s own from 2021 on, with EPA’s national file for 2012 to 2019. Redwood Estates’s own annual report, which it must send you every year, has the contaminants this page does not show.
Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.
What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.
Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; Colorado’s results run from Feb. 23, 2021 to Aug. 21, 2026.
Testing your own tap
The 3 labs Colorado certifies closest to the area Redwood Estates serves, 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 4 miles
Certified for bacteria
Colorado Analytical Laboratory - Commerce City
Commerce City, CO · about 7 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, PFAS, radioactivity
Eurofins Denver
Arvada, CO · about 7 miles
Certified for nitrate, minerals and other inorganics, organic chemicals, PFAS
Sources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- Colorado Department of Public Health and Environment, Water Quality Control Division, results from Jan. 3, 2020 to Oct. 6, 2026, read Oct. 17, 2026
- Certified labs: CDPHE certified drinking water laboratories, read Oct. 16, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
- Hardness: Colorado Department of Public Health and Environment, Water Quality Control Division, results from Nov. 19, 2024 to Nov. 19, 2024, read Oct. 17, 2026
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID CO0101667. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Nothing here is above a health goalIn EPA’s and Colorado’s records for this utility. They don’t cover everything, which is why the next step matters.Every contaminant TapBuff tracks
- Get the utility’s own reportRedwood Estates must send you a water quality report every year. It covers contaminants this page does not show.How to read it
- Test your own tap for leadYour service line, solder and fixtures decide the lead at your faucet, not the utility’s average.Lead in your water: what to do
- 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