Cottage Grove

Cottage Grove, MN · ~39,712 people served

Check your exact address → Cottage Grove overview

100

Excellent

PurityRadar safety score

PWSID

MN1820004

State

Minnesota

City

Cottage Grove

Population served

39,712

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Apr 2025). Levels in parts per trillion (ppt).

PFBA

102 ppt

limit —

No federal limit

PFPeA

4.9 ppt

limit —

No federal limit

Violations & enforcement

No violations are on record for this system in EPA’s SDWIS/ECHO data.

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Nitrate

2 stations · latest Oct 2024

1.16 · max 7.02 mg/L · 53

Copper

4 stations · latest Sep 2025

1.5 · max 27.1 ug/L · 33

Lead

3 stations · latest Sep 2025

1.4 · max 10.3 ug/L · 24

Manganese

1 station · latest Aug 2023

27.9 · max 72.8 ug/L · 4

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system MN1820004 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.