Benton County Water Quality
Benton County, Minnesota: one city report built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
Highest result for each contaminant
One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.
Perfluorohexanesulfonic acid (PFHxS)Sauk Rapids10 ng/L federal MCL (2024) · US EPA34.2 ng/L
- Sauk Rapids34.2 ng/LSample date: 2023-07-17 to 2024-02-20
Perfluorooctanesulfonic acid (PFOS)Sauk Rapids4.0 ng/L federal MCL (2024) · US EPA12 ng/L
- Sauk Rapids12 ng/LSample date: 2023-07-17 to 2024-02-20
Perfluorooctanoic acid (PFOA)Sauk Rapids4.0 ng/L federal MCL (2024) · US EPA8.1 ng/L
- Sauk Rapids8.1 ng/LSample date: 2023-07-17 to 2024-02-20
LithiumSauk Rapids10 µg/L EPA health reference level (screening, not a legal limit) · US EPA9.1 µg/L
- Sauk Rapids9.1 µg/LSample date: 2023-07-17 to 2024-02-20
Perfluorobutanesulfonic acid (PFBS)Sauk Rapids2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPA9.1 ng/L
- Sauk Rapids9.1 ng/LSample date: 2023-07-17 to 2024-02-20
Perfluorohexanoic acid (PFHxA)Sauk Rapids400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLE7.4 ng/L
- Sauk Rapids7.4 ng/LSample date: 2023-07-17 to 2024-02-20
Perfluorobutanoic acid (PFBA)Sauk RapidsNo federal or state limit; shown for transparency14.6 ng/L
- Sauk Rapids14.6 ng/LSample date: 2023-07-17 to 2024-02-20
Perfluoroheptanoic acid (PFHpA)Sauk RapidsNo federal or state limit; shown for transparency3.6 ng/L
- Sauk Rapids3.6 ng/LSample date: 2023-07-17 to 2024-02-20
1 more contaminant detectedShow
Perfluoropentanoic acid (PFPeA)Sauk RapidsNo federal or state limit; shown for transparency6 ng/L
- Sauk Rapids6 ng/LSample date: 2023-07-17 to 2024-02-20
22 substances tested, none detected in this systemShow
Tested in this system: Sauk Rapids
- 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- Lead (90th percentile)
- N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Perfluoro-3-methoxypropanoic acid (PFMPA)
- Perfluoro-4-methoxybutanoic acid (PFMBA)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluorononanoic acid (PFNA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.
0of 1 city above the 15 µg/L action level
Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.
Lead in MinnesotaLargest water systems
- Sauk RapidsSauk Rapids · MN105000413,835 served
Frequently asked
How does Benton County tap water compare across cities?
PurityMap ranks 1 city in Benton County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Sauk Rapids's main water system: Sauk Rapids · PWSID MN1050004 · Purity Score 57 (Fair) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.
How many Benton County cities had a PFAS sample above a 2024 EPA limit?
1 of 1 Benton County city report had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Sauk Rapids (PFHxS 34.2 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 1.
Is there lead in Benton County tap water?
Utilities report lead as a 90th-percentile result from home taps. 0 of 1 Benton County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
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