Full contaminant data, sample history, and sourcing for Lac qui Parle County. For readers who want to go beyond the summary.
Contaminant Data — All Analytes
134 well testing events on record, covering
18 analytes.
Data spans 1960 to 2025.
Contaminant
Samples
Years
Detection Rate
Distribution LowModHigh
vs. Limit
vs. MN Avg
Manganese
119
1963–2024
98%
452% of limit
~ typical
Iron
129
1963–2025
89%
850% of limit
~ typical
Sulfate
129
1963–2025
100%
179% of limit
↑ 848% above
Arsenic
97
1995–2024
82%
20% of limit
↓ 76% below
Chloride
129
1963–2025
100%
3% of limit
↓ 64% below
Nitrate
32
1963–1998
69%
0% of limit
↓ 100% below
Lead
97
1995–2024
11%
1% of limit
↓ 98% below
Fluoride
129
1963–2025
99%
8% of limit
~ typical
HFPO-DA (GenX)
municipal
2
2025
0%
—
—
Nitrite
19
1989–1998
84%
0% of limit
↓ 87% below
PFHxS
municipal
2
2025
0%
—
—
PFNA
municipal
2
2025
0%
—
—
PFOA
municipal
2
2025
0%
—
—
PFOS
municipal
2
2025
0%
—
—
Sodium
129
1963–2025
100%
—
↑ 167% above
pH
9
1963–1990
100%
—
~ typical
PFBS
municipal
2
2025
0%
—
—
Hardness
6
1963–1966
100%
—
↑ 71% above
Distribution shows the share of samples in each concentration band relative to the EPA Maximum Contaminant Level (MCL): Low = below half the MCL, Moderate = between half and the MCL, High = above the MCL. Analytes without an MCL (e.g. sodium, pH) show — in the limit columns. State average is based on county median values across MN.
Compare your result with Lac qui Parle County
Of the 97 arsenic tests on record for Lac qui Parle County (1995–2024),
18% found none, and half were below 1.31 µg/L.
Of the 129 chloride tests on record for Lac qui Parle County (1963–2025),
0% found none, and half were below 6.92 mg/L.
Of the 129 fluoride tests on record for Lac qui Parle County (1963–2025),
1% found none, and half were below 310 µg/L.
Of the 129 iron tests on record for Lac qui Parle County (1963–2025),
11% found none, and half were below 2.42 mg/L.
Of the 97 lead tests on record for Lac qui Parle County (1995–2024),
89% found none.
Of the 119 manganese tests on record for Lac qui Parle County (1963–2024),
2% found none, and half were below 216 µg/L.
Of the 32 nitrate tests on record for Lac qui Parle County (1963–1998),
31% found none, and half were below 5 µg/L.
Of the 129 sulfate tests on record for Lac qui Parle County (1963–2025),
0% found none, and half were below 448 mg/L.
Data Coverage & Gaps
Well-sampled analytes (15+ samples)
Manganese 119 samples
Iron 129 samples
Sulfate 129 samples
Arsenic 97 samples
Chloride 129 samples
Nitrate 32 samples
Lead 97 samples
Fluoride 129 samples
Nitrite 19 samples
Sodium 129 samples
Limited data (<15 samples) — interpret with caution
pH 9 samples
Hardness 6 samples
No private-well PFAS data for Lac qui Parle County
We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Lac qui Parle County.
PFAS testing for private wells requires a dedicated lab panel (~$300–$500). If you are near a military base, airport, or industrial site, consider testing proactively. Learn more about PFAS →
Public vs. Private Water in Lac qui Parle County
23Active public water systems
6,094Residents on public water
45%Households on private wells
Public water systems in Lac qui Parle County are regulated by the EPA and must test and report contaminant levels. Private well owners are responsible for their own testing — there is no routine monitoring of private wells by any government agency.
CDC Health Outcome Correlations
Where contaminants detected in Lac qui Parle County have established associations with specific health outcomes, we cross-reference CDC PLACES county-level prevalence data. This is a contextual signal, not a causal claim.
This report aggregates data from the following public databases:
Water Quality Portal (WQP) — groundwater sample results for Lac qui Parle County from EPA, USGS, and state agencies. Browse WQP data →
EPA Safe Drinking Water Information System (SDWIS) — public water system inventory used to estimate the share of residents on private wells. Browse SDWIS →
Census ACS 5-Year Estimates — well and cistern household counts (variable DP04_0074E) used to calculate the private-well percentage for Lac qui Parle County. Census data explorer →
USGS Aquifer Atlas — principal aquifer type underlying Lac qui Parle County, which informs which contaminants are geologically likely. USGS Aquifer Atlas →
EPA UCMR 5 (2023–2025) — PFAS occurrence data from public water systems, used as a proxy indicator for aquifer PFAS exposure. Rows marked "municipal" in the table above come from this source. About UCMR 5 →
EPA Toxics Release Inventory (TRI) — industrial facility chemical releases near Lac qui Parle County, used in contamination risk scoring. TRI Explorer →
EPA Superfund NPL — National Priorities List sites in or near Lac qui Parle County, used in contamination risk scoring. Superfund site search →
CDC PLACES — county-level health outcome prevalence (kidney disease, cancer, heart disease) correlated with detected contaminants. About CDC PLACES →
Methodology
Raw records are downloaded from the Water Quality Portal and normalized to µg/L (ppb). Records are deduplicated by sample ID and date, and certified outliers are excluded. Analyte names are mapped to EPA canonical forms. Detection rates, distribution bands, and MCL comparisons are computed from the normalized dataset.
Distribution bands use the EPA Maximum Contaminant Level as the threshold: concentrations below 50% of the MCL are classed as Low, between 50% and 100% as Moderate, and above 100% as High. For analytes without an MCL (sodium, hardness, pH), distribution is not computed.
State comparison uses the median of county median values across all counties in MN with at least one sample for that analyte.