Data & Methodology — Hubbard County

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

Contaminant Data — All Analytes

573 well testing events on record, covering 18 analytes. Data spans 1964 to 2024.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. MN Avg
Manganese 284 1964–2025 64%
340% of limit ↓ 31% below
Iron 400 1964–2025 75%
27% of limit ↓ 96% below
Nitrate 123 1964–2017 80%
38% of limit ↑ 55% above
PFOA municipal 27 2006–2025 63%
28% of limit ↓ 94% below
PFOS municipal 17 2024–2025 53%
12% of limit ↓ 94% below
Arsenic 141 1987–2025 55%
5% of limit ↓ 94% below
Chloride 468 1964–2025 96%
1% of limit ↓ 85% below
Lead 143 1987–2025 14%
1% of limit ↓ 97% below
Fluoride 227 1964–2025 86%
2% of limit ↓ 64% below
HFPO-DA (GenX) municipal 8 2024–2025 0%
— —
Nitrite 97 1979–2017 53%
0% of limit ↓ 75% below
PFHxS municipal 3 2024 33%
50% of limit ↓ 38% below
PFNA municipal 11 2006–2025 9%
6% of limit ↓ 63% below
Sulfate 332 1964–2025 88%
2% of limit ↓ 87% below
Sodium 316 1964–2025 99%
— ↓ 90% below
pH 291 1964–2017 100%
— ~ typical
PFBS municipal 2 2024 0%
— —
Hardness 163 1964–2017 99%
— ↓ 28% below

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 Hubbard County

Of the 141 arsenic tests on record for Hubbard County (1987–2025), 45% found none, and half were below 0.125 µg/L.

Of the 468 chloride tests on record for Hubbard County (1964–2025), 4% found none, and half were below 2.5 mg/L.

Of the 227 fluoride tests on record for Hubbard County (1964–2025), 14% found none, and half were below 100 µg/L.

Of the 400 iron tests on record for Hubbard County (1964–2025), 25% found none, and half were below 20 µg/L.

Of the 143 lead tests on record for Hubbard County (1987–2025), 86% found none.

Of the 284 manganese tests on record for Hubbard County (1964–2025), 36% found none, and half were below 101 µg/L.

Of the 123 nitrate tests on record for Hubbard County (1964–2017), 20% found none, and half were below 1.3 mg/L.

Of the 25 pfoa tests on record for Hubbard County (2006–2025), 32% found none, and half were below 0.607 ng/L.

Of the 332 sulfate tests on record for Hubbard County (1964–2025), 12% found none, and half were below 4.88 mg/L.

Have a number from your lab? Enter it to see where it falls. Nothing is sent anywhere.

Want the full picture for your well? Check all your results.

Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Manganese 284 samples
  • Iron 400 samples
  • Nitrate 123 samples
  • PFOA 27 samples
  • PFOS 17 samples
  • Arsenic 141 samples
  • Chloride 468 samples
  • Lead 143 samples
  • Fluoride 227 samples
  • Nitrite 97 samples
  • Sulfate 332 samples
  • Sodium 316 samples
  • pH 291 samples
  • Hardness 163 samples

Limited data (<15 samples) — interpret with caution

  • HFPO-DA (GenX) 8 samples
  • PFHxS 3 samples
  • PFNA 11 samples

Public vs. Private Water in Hubbard County

146 Active public water systems
15,568 Residents on public water
77% Households on private wells

Public water systems in Hubbard 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 Hubbard 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 Hubbard County Prevalence MN Average Source Year
Arsenic Cancer prevalence 9.1% 7.0% 2020
Arsenic Kidney disease rate 3.6% 2.9% 2020
Lead Heart disease rate 5.7% 6.6% 2020

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