Rosewood Acres
What EPA’s and Montana’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
- 50 people
- Connections
- 21
- Water source
- Groundwater
- Based in
- Kalispell, MT
- County
- Flathead
- Owner
- Private
- Hardness
- Hard
The short answer
Nothing in EPA’s and Montana’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
Chromium (total), fluoride, nitrate, arsenic and total trihalomethanes (TTHM): Montana’s own results, samples taken from Aug. 5, 2022 to April 21, 2025, with EPA’s 2012 to 2019 file for earlier years.
Uranium: EPA’s compliance monitoring file, samples taken from April 28, 2016 to March 13, 2017. Newer results are in the utility’s annual water quality report.
Below EPA’s limits3
Chromium (total)
Comes from the source
3.0ppb
Highest yearly average, 2022 to 2025
2025: not found
Averaged by year, the highest was 3.0 ppb, in 2022, below EPA’s legal limit of 100 ppb. 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 yearly average of 4.0 ppb, in 2019.
What handles it
- NSF/ANSI 58 look for “Chromium (Hexavalent) Reduction”
- NSF/ANSI 53 look for “Chromium Reduction”
Fluoride
Forms or is added in treatment
0.07ppm
Highest yearly average, 2022 to 2025
2025, one sample: 0.07 ppm
Averaged by year, the highest was 0.07 ppm, in 2022, below EPA’s legal limit of 4.0 ppm. In 2025, the latest year on file, its one sample was 0.07 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.2 ppm, in 2016.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
Nitrate
Comes from the source
0.17ppm
Highest sample; found in 2 of 2
2025, one sample: 0.17 ppm
The highest sample, in 2025, was 0.17 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its one sample was 0.17 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.47 ppm, in 2016.
What handles it
- NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
- NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
4 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Arsenic
- Lead
- Total trihalomethanes (TTHM)
- Uranium
Hardness
Hard, 136 mg/L (8 grains per gallon), at its one sampling point, in 2016.
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. There are 2 monitoring or reporting violations: a sample missed, late or not reported.
What this report can’t tell you
Everything else. Chromium (total), fluoride, nitrate, arsenic and total trihalomethanes (TTHM) results here are Montana’s own from 2022 on, with EPA’s national file for 2012 to 2019. Uranium comes from EPA’s file alone, which ends in 2019. Rosewood Acres’s own annual report, which it must send you every year, has newer results for those and 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; Montana’s results run from Aug. 5, 2022 to April 21, 2025; EPA’s compliance samples are from April 28, 2016 to March 13, 2017.
Testing your own tap
No lab Montana certifies is within 75 miles of the area Rosewood Acres serves on the state’s list. Some take samples by mail; the state’s page lists them all.
Montana State Environmental Laboratory: Private well testing packages for bacteria, metals, nutrients, anions, organic chemicals and more, open to the public. Samples can be mailed, sent by the lab's free courier, or dropped off at the lab. Environmental Laboratory, Montana Department of Public Health and Human Services.
All 36 certified labs for MontanaSources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- Montana Department of Environmental Quality, Public Water Supply, results from Jan. 2, 2020 to Oct. 6, 2026, read Oct. 18, 2026
- EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
- Hardness: Montana Department of Environmental Quality, Public Water Supply, results from April 28, 2016 to April 28, 2016, read Oct. 18, 2026
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID MT0004658. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Nothing here is above a health goalIn EPA’s and Montana’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 reportRosewood Acres must send you a water quality report every year. It covers contaminants this page does not show, and has newer results than EPA’s national file for the ones here that come from it.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