San Lazaro Mfctd Housing Community
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
- 844 people
- Connections
- 213
- Water source
- Surface water
- Based in
- Lafayette, CO
- County
- Boulder
- Owner
- Private
- Hardness
- Very 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. 3 health-based violations since 2016.
What was found
Total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, nitrate, chromium (total), arsenic and uranium: Colorado’s own results, samples taken from June 29, 2020 to July 29, 2026, with EPA’s 2012 to 2019 file for earlier years.
Below EPA’s limits5
Total trihalomethanes (TTHM)
Forms or is added in treatment
52.7ppb
Highest yearly average, 2020 to 2026
2026 average: 10.6 ppb
Averaged by year, the highest was 52.7 ppb, in 2021, below EPA’s legal limit of 80 ppb. Its highest single sample was 53.7 ppb. In 2026, the latest year on file, its three samples averaged 10.6 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 43.4 ppb, in 2019.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
Haloacetic acids (HAA5)
Forms or is added in treatment
15.4ppb
Highest yearly average, 2020 to 2026
2026 average: 8.5 ppb
Averaged by year, the highest was 15.4 ppb, in 2022, below EPA’s legal limit of 60 ppb. Its highest single sample was 20.8 ppb. In 2026, the latest year on file, its three samples averaged 8.5 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 14.8 ppb, in 2018.
What handles it
No certification claim covers this compound yet.
Fluoride
Forms or is added in treatment
0.45ppm
Highest yearly average, 2020 to 2024
Averaged by year, the highest was 0.45 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.42 ppm, in 2012.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
Nitrate
Comes from the source
0.9ppm
Highest sample; found in 4 of 6
2025: not found
The highest sample, in 2021, was 0.9 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 1.9 ppm, in 2017.
What handles it
- NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
- NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
Chromium (total)
Comes from the source
3.0ppb
Highest yearly average, 2020 to 2022
2022, one sample: 3.0 ppb
Averaged by year, the highest was 3.0 ppb, in 2021, below EPA’s legal limit of 100 ppb. In 2022, the latest year on file, its one sample was 3.0 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 3.0 ppb, in 2015.
What handles it
- NSF/ANSI 58 look for “Chromium (Hexavalent) Reduction”
- NSF/ANSI 53 look for “Chromium Reduction”
3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Arsenic
- Lead
- Uranium
Hardness
Very hard, typically 250 mg/L (14.6 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
| Contaminant or rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| Surface Water Treatment Rule | Required treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR) | Aug. 1, 2021 to Aug. 31, 2021 | — | Resolved |
| Interim Enhanced Surface Water Treatment Rule | Too many readings in a month showed cloudiness above the filtration standard.EPA: Monthly Turbidity Exceed (Enhanced SWTR) | Nov. 1, 2019 to Nov. 30, 2019 | — | Resolved |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Treatment was not run by a certified operator as required.EPA: Treatment Technique No Certif. Operator | July 1, 2016 | — | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 97 monitoring or reporting violations not shown. | ||||
What this report can’t tell you
Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, nitrate, chromium (total), arsenic and uranium results here are Colorado’s own from 2020 on, with EPA’s national file for 2012 to 2019. San Lazaro Mfctd Housing Community’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 June 29, 2020 to July 29, 2026.
Testing your own tap
The 3 labs Colorado certifies closest to the area San Lazaro Mfctd Housing Community serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Hazen Research
Golden, CO · about 16 miles
Certified for nitrate, lead and copper, metals, minerals and other inorganics, radioactivity
Murray-Brown Laboratories, LLC.
Northglenn, CO · about 17 miles
Certified for bacteria
Eurofins Denver
Arvada, CO · about 18 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
- EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
- 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 July 10, 2024 to Aug. 29, 2024, read Oct. 17, 2026
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID CO0107701. 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 reportSan Lazaro Mfctd Housing Community 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