Data & Methodology — Renville County

Full contaminant data, sample history, and sourcing for Renville County. For readers who want to go beyond the summary.

Contaminant Data — All Analytes

166 well testing events on record, covering 19 analytes. Data spans 1964 to 2025.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. MN Avg
Iron 128 1964–2017 97%
751% of limit ~ typical
Manganese 38 1964–2017 100%
303% of limit ↓ 38% below
Sulfate 130 1964–2017 96%
52% of limit ↑ 177% above
Arsenic 102 1993–2015 66%
84% of limit ~ typical
Nitrate 151 1964–2017 77%
0% of limit ↓ 99% below
Lead 102 1993–2015 60%
1% of limit ↓ 97% below
Uranium 90 2014–2015 73%
1% of limit ↓ 70% below
Chloride 138 1964–2025 100%
2% of limit ↓ 78% below
Fluoride 128 1964–2017 95%
8% of limit ~ typical
HFPO-DA (GenX) municipal 2 2024 0%
— —
Nitrite 127 1989–2017 22%
0% of limit ↓ 63% below
PFHxS municipal 2 2024 0%
— —
PFNA municipal 3 2007–2024 0%
— —
PFOA municipal 3 2007–2024 0%
— —
PFOS municipal 2 2024 0%
— —
Hardness 22 1964–2017 100%
— ~ typical
PFBS municipal 2 2024 0%
— —
pH 43 1964–2017 100%
— ~ typical
Sodium 128 1964–2017 100%
— ↑ 120% 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 Renville County

Of the 102 arsenic tests on record for Renville County (1993–2015), 34% found none, and half were below 2.04 µg/L.

Of the 138 chloride tests on record for Renville County (1964–2025), 0% found none, and half were below 4.14 mg/L.

Of the 128 fluoride tests on record for Renville County (1964–2017), 5% found none, and half were below 323 µg/L.

Of the 128 iron tests on record for Renville County (1964–2017), 3% found none, and half were below 2.11 mg/L.

Of the 102 lead tests on record for Renville County (1993–2015), 40% found none, and half were below 0.125 µg/L.

Of the 38 manganese tests on record for Renville County (1964–2017), 0% found none, and half were below 152 µg/L.

Of the 151 nitrate tests on record for Renville County (1964–2017), 23% found none, and half were below 14 µg/L.

Of the 130 sulfate tests on record for Renville County (1964–2017), 4% found none, and half were below 128 mg/L.

Of the 90 uranium tests on record for Renville County (2014–2015), 27% found none, and half were below 0.16 µg/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Iron 128 samples
  • Manganese 38 samples
  • Sulfate 130 samples
  • Arsenic 102 samples
  • Nitrate 151 samples
  • Lead 102 samples
  • Uranium 90 samples
  • Chloride 138 samples
  • Fluoride 128 samples
  • Nitrite 127 samples
  • Hardness 22 samples
  • pH 43 samples
  • Sodium 128 samples

Limited data (<15 samples) — interpret with caution

  • PFNA 3 samples
  • PFOA 3 samples

Public vs. Private Water in Renville County

28 Active public water systems
11,220 Residents on public water
35% Households on private wells

Public water systems in Renville 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 Renville 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.

Contaminant Associated Condition Renville County Prevalence MN Average Source Year
Arsenic Cancer prevalence 8.3% 7.0% 2020
Arsenic Kidney disease rate 3.4% 2.9% 2020
Lead Heart disease rate 5.8% 6.6% 2020

Source: CDC PLACES county-level estimates. Raw data: Download Renville County CDC PLACES data →

Data Sources

This report aggregates data from the following public databases:

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.

Last updated: 2026-08-04

Full methodology →