Dakota County Water Quality: 8 Cities Ranked by the Records
Dakota County, Minnesota: 8 city reports 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.
Perfluorooctanoic acid (PFOA)Detected in 2 systems of 8 tested4.0 ng/L federal MCL (2024) · US EPAHighest23.7 ng/L
- Hastings23.7 ng/LSample date: 2024-11-06 to 2025-06-11
- South Saint Paul7.6 ng/LSample date: 2024-07-30 to 2024-11-07
- BurnsvilleNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-10-18 to 2025-01-28
- EaganNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-26 to 2025-05-20
- FarmingtonNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-10-21 to 2024-11-07
- Inver Grove HeightsNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-22 to 2023-09-12
- LakevilleNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-03-31 to 2025-09-29
- RosemountNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-05-04 to 2024-09-12
LithiumDetected in 4 systems of 8 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest11.7 µg/L
- Burnsville11.7 µg/LSample date: 2023-10-18 to 2024-08-12
- Lakeville10.7 µg/LSample date: 2025-03-31 to 2025-09-29
- Eagan9.6 µg/LSample date: 2024-06-26 to 2025-05-20
- Inver Grove Heights9.6 µg/LSample date: 2023-03-22 to 2023-09-12
- FarmingtonNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-05-15 to 2024-11-07
- HastingsNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-11-06 to 2025-06-11
- RosemountNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-02-14 to 2023-08-08
- South Saint PaulNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-05-13 to 2024-11-07
Perfluorooctanesulfonic acid (PFOS)Detected in 1 system of 8 tested4.0 ng/L federal MCL (2024) · US EPAHighest4.6 ng/L
- Hastings4.6 ng/LSample date: 2024-11-06 to 2025-06-11
- BurnsvilleNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-10-18 to 2025-01-28
- EaganNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-26 to 2025-05-20
- FarmingtonNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-10-21 to 2024-11-07
- Inver Grove HeightsNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-22 to 2023-09-12
- LakevilleNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-03-31 to 2025-09-29
- RosemountNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-05-04 to 2024-09-12
- South Saint PaulNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-07-30 to 2024-11-07
Perfluorohexanesulfonic acid (PFHxS)Detected in 2 systems of 8 tested10 ng/L federal MCL (2024) · US EPAHighest5.6 ng/L
- South Saint Paul5.6 ng/LSample date: 2024-07-30 to 2024-11-07
- Hastings3.4 ng/LSample date: 2024-11-06 to 2025-06-11
- BurnsvilleNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-18 to 2025-01-28
- EaganNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-26 to 2025-05-20
- FarmingtonNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-10-21 to 2024-11-07
- Inver Grove HeightsNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-22 to 2023-09-12
- LakevilleNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-31 to 2025-09-29
- RosemountNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-05-04 to 2024-09-12
Lead (90th percentile)Detected in 4 systems of 8 tested15 µg/L federal action level · US EPAHighest8 µg/L
- South Saint Paul8 µg/LMonitoring period: 2023–2025
- Hastings3 µg/LMonitoring period: 2022–2024
- Inver Grove Heights3 µg/LMonitoring period: 2023–2025
- Rosemount3 µg/LMonitoring period: 2023–2025
- BurnsvilleNot detectedMonitoring period: 2022–2024
- EaganNot detectedMonitoring period: 2023–2025
- FarmingtonNot detectedMonitoring period: 2025–2025
- LakevilleNot detectedMonitoring period: 2023–2025
Perfluorobutanesulfonic acid (PFBS)Detected in 2 systems of 8 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest4.7 ng/L
- South Saint Paul4.7 ng/LSample date: 2024-07-30 to 2024-11-07
- Hastings3.3 ng/LSample date: 2024-11-06 to 2025-06-11
- BurnsvilleNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-18 to 2025-01-28
- EaganNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-26 to 2025-05-20
- FarmingtonNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-10-21 to 2024-11-07
- Inver Grove HeightsNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-22 to 2023-09-12
- LakevilleNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-31 to 2025-09-29
- RosemountNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-05-04 to 2024-09-12
Perfluorohexanoic acid (PFHxA)Detected in 2 systems of 8 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest9.2 ng/L
- Hastings9.2 ng/LSample date: 2024-11-06 to 2025-06-11
- South Saint Paul4.7 ng/LSample date: 2024-07-30 to 2024-11-07
- BurnsvilleNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-18 to 2025-01-28
- EaganNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-26 to 2025-05-20
- FarmingtonNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-10-21 to 2024-11-07
- Inver Grove HeightsNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-22 to 2023-09-12
- LakevilleNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-31 to 2025-09-29
- RosemountNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-05-04 to 2024-09-12
Perfluorobutanoic acid (PFBA)Detected in 7 systems of 8 testedNo federal or state limit; shown for transparencyHighest380 ng/L
- Hastings380 ng/LSample date: 2024-11-06 to 2025-10-22
- South Saint Paul168 ng/LSample date: 2024-07-30 to 2024-11-07
- Inver Grove Heights102 ng/LSample date: 2023-03-22 to 2023-09-12
- Rosemount70.3 ng/LSample date: 2023-05-04 to 2024-09-12
- Farmington35.7 ng/LSample date: 2024-10-21 to 2024-11-07
- Burnsville25.5 ng/LSample date: 2023-10-18 to 2025-01-28
- Eagan19.3 ng/LSample date: 2024-06-26 to 2025-05-20
- LakevilleNot detected · below 5.0 ng/L lab reporting limitSample date: 2025-03-31 to 2025-09-29
1 more contaminant detectedShow
Perfluoropentanoic acid (PFPeA)Detected in 3 systems of 8 testedNo federal or state limit; shown for transparencyHighest20.5 ng/L
- Hastings20.5 ng/LSample date: 2024-11-06 to 2025-06-11
- South Saint Paul11 ng/LSample date: 2024-07-30 to 2024-11-07
- Inver Grove Heights3.5 ng/LSample date: 2023-03-22 to 2023-09-12
- BurnsvilleNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-18 to 2025-01-28
- EaganNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-26 to 2025-05-20
- FarmingtonNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-10-21 to 2024-11-07
- LakevilleNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-31 to 2025-09-29
- RosemountNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-05-04 to 2024-09-12
22 PFAS tested, none detected in any systemShow
Tested in these 8 systems: Burnsville, Eagan, Farmington, Hastings, Inver Grove Heights, Lakeville, Rosemount, South Saint Paul
- 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)
- 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)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorononanoic acid (PFNA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
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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 8 cities 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
- EaganEagan · MN119000768,223 served
- LakevilleLakeville · MN119001567,300 served
- BurnsvilleBurnsville · MN119000264,317 served
- Inver Grove HeightsInver Grove Heights · MN119001434,189 served
- RosemountRosemount · MN119001926,500 served
- FarmingtonFarmington · MN119000823,534 served
- HastingsHastings · MN119001223,222 served
- South Saint PaulSouth Saint Paul · MN119002020,664 served
Frequently asked
How does Dakota County tap water compare across cities?
PurityMap ranks 8 cities in Dakota 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 Eagan's main water system: Eagan · PWSID MN1190007 · Purity Score 100 (Excellent) · 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 Dakota County cities had a PFAS sample above a 2024 EPA limit?
2 of 8 Dakota County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Hastings (PFOA 23.7 ng/L), South Saint Paul (PFOA 7.6 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 7.
Is there lead in Dakota County tap water?
Utilities report lead as a 90th-percentile result from home taps. 4 of 8 Dakota 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.
Have Dakota County water systems had drinking-water violations?
4 cities in Dakota County have a health-based violation in the federal SDWIS record within about the last ten years. Each city report lists the contaminant, year and whether it was resolved.
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