Solitude MD

What EPA’s and Colorado’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals, plus violations since 2016, with the certification that handles each result.

Serves: 40 people
Connections: 16
Water source: Groundwater
Based in: Castle Rock, CO
County: Douglas
Owner: Private

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, not everything. No health-based violations on file since 2016.

What was found

Fluoride, total trihalomethanes (TTHM), nitrate, arsenic, chromium (total) and haloacetic acids (HAA5): Colorado’s own results, samples taken from Sept. 23, 2026 to Sept. 23, 2026.

Below EPA’s limits3

Fluoride

Forms or is added in treatment

Below EPA’s limits

1.1ppm

Highest yearly average, 2026

Averaged by year, the highest was 1.1 ppm, in 2026, 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”

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

5.4ppb

Highest yearly average, 2026

Averaged by year, the highest was 5.4 ppb, in 2026, below EPA’s legal limit of 80 ppb. That is the only year on file.

What handles it

NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Nitrate

Comes from the source

Below EPA’s limits

0.5ppm

One sample

2026, one sample: 0.5 ppm

The highest sample, in 2026, was 0.5 ppm, below EPA’s legal limit of 10 ppm. That is the only year on file, and its one sample was 0.5 ppm.

What handles it

NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.

Arsenic
Chromium (total)
Haloacetic acids (HAA5)

Violations since 2016

No health-based violations on file with EPA since 2016.

What this report can’t tell you

Everything else. Fluoride, total trihalomethanes (TTHM), nitrate, arsenic, chromium (total) and haloacetic acids (HAA5) results here are Colorado’s own from 2026 on, with EPA’s national file for 2012 to 2019. Solitude MD’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 Sept. 23, 2026 to Sept. 23, 2026.

Testing your own tap

Solitude MD’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab Colorado certifies.

No lab Colorado certifies is within 75 miles of the area Solitude MD serves on the state’s list. Some take samples by mail; the state’s page lists them all.

All 54 certified labs for Colorado