Lasalle
What EPA’s and Minnesota’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
- 90 people
- Connections
- 61
- Water source
- Groundwater bought from another system
- Based in
- Lasalle, MN
- County
- Watonwan
- Owner
- Local government
The short answer
1 result is above the health goal. The worst: Arsenic, above the health goal. 1 health-based violation since 2016.
What handles itWhat was found
Total trihalomethanes (TTHM) and haloacetic acids (HAA5): Minnesota’s yearly summaries per water system, 2023 to 2025.
Arsenic, fluoride, chromium (total) and nitrate: EPA’s compliance monitoring file, samples taken from March 13, 2012 to Oct. 29, 2019. Newer results are in the utility’s annual water quality report.
Above the health goal1
Arsenic
Comes from the source
9.5ppb
Highest yearly average, 2012 to 2019
Averaged by year, the highest was 9.5 ppb, in 2019: below EPA’s legal limit of 10 ppb, but above its health goal of zero. That was also the latest year on file.
What handles it
- NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
- NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
Below EPA’s limits3
Total trihalomethanes (TTHM)
Forms or is added in treatment
44.7ppb
Highest yearly average, 2023 to 2025
2025 average: 39.4 ppb
Averaged by year, the highest was 44.7 ppb, in 2023, below EPA’s legal limit of 80 ppb. In 2025, the latest year on file, it averaged 39.4 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
1.5ppm
Highest yearly average, 2012 to 2019
2019 average: 0.6 ppm
Averaged by year, the highest was 1.5 ppm, in 2012, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 2.3 ppm. In 2019, the latest year on file, its five samples averaged 0.6 ppm. One result, 82 ppm on Dec. 26, 2017 in EPA’s file, is left out as a likely entry error: the typical result there is 0.98 ppm.
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
21ppb
Highest yearly average, 2023 to 2025
2025 average: 18.4 ppb
Averaged by year, the highest was 21 ppb, in 2023, below EPA’s legal limit of 60 ppb. In 2025, the latest year on file, it averaged 18.4 ppb.
What handles it
No certification claim covers this compound yet.
3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Chromium (total)
- Lead
- Nitrate
What handles it
A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”
- NSF/ANSI 53
Claim: Arsenic (Pentavalent)<=50 ppb Reduction
For: Arsenic
Other certifiers’ wording: Arsenic (III) (50 ppb influent level)
- NSF/ANSI 58
Claim: Arsenic (Pentavalent)<=50 ppb Reduction
For: Arsenic
Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)
At the tap, or for the whole house?
These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. How whole-house systems compare.
Filters with those claims on a certifier’s listing
Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money
Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Arsenic
Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Brondell Capella RC250 Reverse Osmosis System
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Violations since 2016
| Contaminant or rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| Lead and Copper Rule | A required study or plan for corrosion control was not done on time.EPA: OCCT/SOWT Study/Recommendation | April 1, 2024 | — | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 6 monitoring or reporting violations not shown. | ||||
What this report can’t tell you
Everything else. Total trihalomethanes (TTHM) and haloacetic acids (HAA5) results here are Minnesota’s own yearly summaries from 2023 on, with EPA’s national file for 2012 to 2019. Arsenic, fluoride, chromium (total) and nitrate come from EPA’s file alone, which ends in 2019. Lasalle’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; Minnesota’s yearly summaries cover 2023 to 2025; EPA’s compliance samples are from March 13, 2012 to Oct. 29, 2019.
Testing your own tap
The 3 labs Minnesota certifies closest to the area Lasalle serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Minnesota Valley Testing Laboratories, Inc.
New Ulm, MN · about 17 miles
Certified for bacteria, nitrate, lead and copper, metals
UC Laboratory
Janesville, MN · about 39 miles
Certified for bacteria, nitrate, metals
Southwest Health and Human Services
Marshall, MN · about 68 miles
Certified for bacteria, nitrate
Sources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- Minnesota Department of Health, Minnesota Public Health Data Access, results from Jan. 1, 2023 to Dec. 31, 2025, read Oct. 8, 2026
- EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
- Certified labs: Minnesota Department of Health, accredited labs in Minnesota accepting drinking water samples from private well users, read Oct. 10, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID MN1830009. Rebuilt from EPA data on Oct. 18, 2026.
Also in Watonwan County
All Minnesota utilitiesWhat to do next
- Read up on ArsenicWhat each one does to health, where it comes from, and the certification claim that addresses it.About Arsenic
- Get the utility’s own reportLasalle 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
- Compare certified filtersWhat the filters certified for these results cost over five years, cartridges included.Compare five-year costs