Greenfield, WI Tap Water Quality 2026

Water quality report for Greenfield, WI — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Greenfield's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Fort Mccoy North Post PWSID: WI6420302 Updated: 2026 Q2

✅

No federal limits exceeded on record

Lead is 8.00 ppb, 53% of the action level and no violations are open. No PFAS was detected.

Greenfield earns a B for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 8.00 ppb — 53% of the federal action level

PFAS tested, none detected

56 violations since 2015, 0 health-based

No violations currently open

Greenfield's lead level vs. all Wisconsin community water systems

0 ppb5 ppb10 ppb15 ppb

Lead level: 8.00 ppb — 53% of the federal action level

✓ Lower lead than 9% of Wisconsin utilities

Population Served

~990 connections

Water Source

Groundwater

Drawn from wells — SDWIS source code GW

Active Violations

56 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)

90th percentile of tap samples collected across the distribution system

53% of EPA action level

8.00 ppb

Action level: 15 ppb

Copper (Cu)

90th percentile of tap samples. SDWIS reports a copper figure only when a system exceeds the action level, so any value here is an exceedance.

107.7% of EPA action level

1,400 ppb

Action level: 1,300 ppb

The 90th-percentile lead result is 8.00 ppb, 53% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

Contaminant	Type	Measured	Limit	Period	Status
Lead and Copper Rule	MONITORING AND REPORTING	—	TT	2022	Resolved
Revised Total Coliform Rule	MONITORING FAILURE	—	—	2017	Resolved
Revised Total Coliform Rule	MONITORING FAILURE	—	—	2017	Resolved
Combined Uranium	MONITORING AND REPORTING	—	30 ug/L	2016	Resolved
Combined Radium (-226 and -228)	MONITORING AND REPORTING	—	5 pCi/L	2015	Resolved
Combined Uranium	MONITORING AND REPORTING	—	30 ug/L	2015	Resolved
Gross Alpha, Excl. Radon and U	MONITORING AND REPORTING	—	15 pCi/L	2015	Resolved
Radium-226	MONITORING AND REPORTING	—	—	2015	Resolved
Radium-228	MONITORING AND REPORTING	—	—	2015	Resolved
1,1-Dichloroethylene	MONITORING AND REPORTING	—	0.007 mg/L	2015	Resolved
trans-1,2-Dichloroethylene	MONITORING AND REPORTING	—	0.1 mg/L	2015	Resolved
1,2-Dichloroethane	MONITORING AND REPORTING	—	0.005 mg/L	2015	Resolved
1,1,1-Trichloroethane	MONITORING AND REPORTING	—	0.2 mg/L	2015	Resolved
Carbon tetrachloride	MONITORING AND REPORTING	—	0.005 mg/L	2015	Resolved
1,2-Dichloropropane	MONITORING AND REPORTING	—	0.005 mg/L	2015	Resolved
Trichloroethylene	MONITORING AND REPORTING	—	0.005 mg/L	2015	Resolved
1,1,2-Trichloroethane	MONITORING AND REPORTING	—	0.005 mg/L	2015	Resolved
Tetrachloroethylene	MONITORING AND REPORTING	—	0.005 mg/L	2015	Resolved
CHLOROBENZENE	MONITORING AND REPORTING	—	0.1 mg/L	2015	Resolved
Benzene	MONITORING AND REPORTING	—	0.005 mg/L	2015	Resolved
Toluene	MONITORING AND REPORTING	—	1 mg/L	2015	Resolved
Ethylbenzene	MONITORING AND REPORTING	—	0.7 mg/L	2015	Resolved
Styrene	MONITORING AND REPORTING	—	0.1 mg/L	2015	Resolved
Vinyl chloride	MONITORING AND REPORTING	—	0.002 mg/L	2015	Resolved
p-Dichlorobenzene	MONITORING AND REPORTING	—	0.075 mg/L	2015	Resolved
o-Dichlorobenzene	MONITORING AND REPORTING	—	0.6 mg/L	2015	Resolved
DICHLOROMETHANE	MONITORING AND REPORTING	—	0.005 mg/L	2015	Resolved
Xylenes, Total	MONITORING AND REPORTING	—	10 mg/L	2015	Resolved
cis-1,2-Dichloroethylene	MONITORING AND REPORTING	—	0.07 mg/L	2015	Resolved
1,2,4-Trichlorobenzene	MONITORING AND REPORTING	—	0.07 mg/L	2015	Resolved
Lead and Copper Rule	MONITORING AND REPORTING	—	TT	2015–2018	Resolved
Endrin	MONITORING AND REPORTING	—	0.002 mg/L	2015	Resolved
BHC-GAMMA	MONITORING AND REPORTING	—	0.0002 mg/L	2015	Resolved
Methoxychlor	MONITORING AND REPORTING	—	0.04 mg/L	2015	Resolved
Toxaphene	MONITORING AND REPORTING	—	0.003 mg/L	2015	Resolved
Dalapon	MONITORING AND REPORTING	—	0.2 mg/L	2015	Resolved
Diquat	MONITORING AND REPORTING	—	0.02 mg/L	2015	Resolved
Endothall	MONITORING AND REPORTING	—	0.1 mg/L	2015	Resolved
Glyphosate	MONITORING AND REPORTING	—	0.7 mg/L	2015	Resolved
OXAMYL	MONITORING AND REPORTING	—	0.2 mg/L	2015	Resolved
Simazine	MONITORING AND REPORTING	—	0.004 mg/L	2015	Resolved
Picloram	MONITORING AND REPORTING	—	0.5 mg/L	2015	Resolved
Dinoseb	MONITORING AND REPORTING	—	0.007 mg/L	2015	Resolved
Hexachlorocyclopentadiene	MONITORING AND REPORTING	—	0.05 mg/L	2015	Resolved
Carbofuran	MONITORING AND REPORTING	—	0.04 mg/L	2015	Resolved
Atrazine	MONITORING AND REPORTING	—	0.003 mg/L	2015	Resolved
LASSO	MONITORING AND REPORTING	—	—	2015	Resolved
Heptachlor	MONITORING AND REPORTING	—	0.0004 mg/L	2015	Resolved
Heptachlor epoxide	MONITORING AND REPORTING	—	0.0002 mg/L	2015	Resolved
2,4-D	MONITORING AND REPORTING	—	0.07 mg/L	2015	Resolved
2,4,5-TP	MONITORING AND REPORTING	—	0.05 mg/L	2015	Resolved
HEXACHLOROBENZENE	MONITORING AND REPORTING	—	0.001 mg/L	2015	Resolved
Pentachlorophenol	MONITORING AND REPORTING	—	0.001 mg/L	2015	Resolved
Chlordane	MONITORING AND REPORTING	—	0.002 mg/L	2015	Resolved
Total Haloacetic Acids (HAA5)	MONITORING AND REPORTING	—	0.060 mg/L	2015	Resolved
TTHM	MONITORING AND REPORTING	—	0.080 mg/L	2015	Resolved

Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

56 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Fort Mccoy North Post

PWSID WI6420302

Water source Groundwater — Drawn from wells — SDWIS source code GW

Population served 4

Service connections 990

Systems serving this area 1

Regulator State primacy agency

Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Greenfield tap water safe to drink? ▼

No federal limit is exceeded on record. No violations are currently open. Lead is 8.00 ppb, 53% of the action level.

Does Greenfield water have PFAS? ▼

It was tested for the six regulated PFAS compounds and none were detected.

Who supplies water to Greenfield? ▼

Fort Mccoy North Post (PWSID WI6420302). Groundwater. Drawn from wells — SDWIS source code GW

When was this system last inspected? ▼

It was last inspected on 2025-01-27. No significant deficiencies were recorded.

What Should Greenfield Residents Do?

Consider a filter certified for lead

Look for NSF/ANSI 53 certification for lead reduction.

Check for a lead service line

Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.

Flush before drinking

If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

Nearby Cities in Wisconsin

Sparta, Wi Tap Water Quality 2026 Monroe Tomah, Wi Tap Water Quality 2026 Monroe Cashton, Wi Tap Water Quality 2026 Monroe Norwalk, Wi Tap Water Quality 2026 Monroe Wilton, Wi Tap Water Quality 2026 Monroe Warrens, Wi Tap Water Quality 2026 Monroe