Monroe’s drinking water comes from Monroe (EPA system MI0004450), which draws surface water from a river, lake or reservoir and treats it before distribution for about 49,467 people. EPA’s records associate 3 sizeable community systems with Monroe; Monroe is the main one, and it is the system this page examines in depth. This page translates that system’s official EPA record — lead and copper results, violation history, and what the data does and does not say — into plain English.
This page is built entirely from the U.S. EPA’s Safe Drinking Water Information System (SDWIS), the same records state regulators use. We did not test Monroe’s water, and system-level data describes the utility’s water as a whole — not what comes out of one specific home’s tap. Where the record is silent, we say so rather than guess.
Key takeaways
- Monroe supplies Monroe (Surface water); it serves about 49,467 people across its service area.
- Monroe’s most recent reported 90th-percentile lead result is 2 ppb, below the EPA action level of 15 ppb.
- 1 health-based violation in the last 10 years — details below, with dates and current status.
- EPA does not track hardness. If you’re shopping for a softener, test first and size from a real grains-per-gallon number.
The water system serving Monroe
Monroe is the community water system the EPA associates with Monroe, Michigan. It reports a population served of about 49,467.
| System | EPA ID | People served | Source water | Role |
|---|---|---|---|---|
| Monroe | MI0004450 | 49,467 | Surface water | Main system |
| Monroe South County | MI0004455 | 33,816 | Purchased surface water | Also serves the area |
| Frenchtown Township | MI0002500 | 21,609 | Surface water | Also serves the area |
EPA’s records associate 1 further system with the Monroe area beyond the ones above — neighbourhood districts, subdivisions and mobile-home parks among them. If your water bill names a different system, that name — not the city name — is the record to check.
Not sure which system serves your address? Run your ZIP code through our What’s In My Water? lookup — it resolves the systems EPA lists for your ZIP and shows the same records in full.
Lead and copper
Lead: Monroe’s most recent reported 90th-percentile lead result is 2 ppb, below the EPA action level of 15 ppb.
Read those numbers carefully: a 90th percentile is a system-wide statistic from a sample of homes, not a test of your tap. Lead in drinking water comes mostly from a home’s own plumbing — service lines, solder and fixtures — so two houses on the same street can test very differently. Homes built before 1986 carry the highest risk, whatever the system average says.
Violation history — the last 10 years
EPA records show 1 health-based violation for Monroe in the last 10 years. Health-based means the serious kind — here is what it was:
- a regulated contaminant (EPA code 8000) — the measured level exceeded the federal legal limit (MCL). Began June 2017; returned to compliance July 2017.
The recent paperwork record is clean too: no monitoring or reporting items in the last 5 years.
What this means for your home
System data sets the background; your home’s plumbing writes the foreground. In practice:
- Lead is a plumbing question, not a system alarm, here. The system’s own result is low, so the remaining risk sits in your home’s pipes and fixtures. A filter certified to NSF/ANSI 53 for lead is cheap insurance for older homes; our water filter guides explain the certifications without the marketing.
- Taste and smell: surface-water systems disinfect with chlorine or chloramine, which is most of what people taste. A basic carbon filter (NSF/ANSI 42) handles it; our chloramine vs chlorine explainer helps you tell which one your water has.
- Hardness is not in this record — by design. The EPA doesn’t track it, so nobody can honestly tell you your grains-per-gallon from this page. Scale on fixtures and shower doors is a hint, not a measurement. Test (strips are a start; a lab test is better — see how to test your water at home), then size any softener with our softener sizing calculator and the softener hub.
- On a private well outside the city system instead? Nothing on this page applies to your water — start with our Michigan well water guide for testing and treatment that fits the state.
Water quality in nearby cities
West Bloomfield, MI · Redford, MI · Holland, MI · Roseville, MI
This guide is one of our per-city water reports — see the full list on the Water Quality hub, alongside our contaminant explainers and testing guides.
Frequently asked questions
Is Monroe water safe to drink?
The honest answer is: largely yes today, with real entries on its record. Monroe has 1 health-based violation in the last 10 years (detailed in the violation section above); all of them now show as returned to compliance. A returned-to-compliance violation is history, not a current failure — and for lead, {lead_clause}. EPA data describes the system as a whole, not your tap; lead usually comes from a home’s own plumbing, so a certified home test is the only way to know your exact water.
Where does Monroe get its drinking water?
Monroe is the community water system the EPA associates with Monroe. It draws surface water from a river, lake or reservoir and treats it before distribution and serves about 49,467 people across its service area (EPA system ID MI0004450). 2 other sizeable systems also report serving parts of Monroe — they are listed in the table above.
What is the lead level in Monroe’s water?
Monroe’s most recent reported 90th-percentile lead result is 2 ppb, below the EPA action level of 15 ppb. That figure is a system statistic from sampled homes, not a test of your tap — your own plumbing decides your exposure, and a certified home test is the only way to know it.
Has Monroe’s water system had violations?
Yes — 1 health-based violation in the last 10 years, listed with dates and status in the violation section above. All of them show as returned to compliance in EPA’s record.
Do I need a water filter in Monroe?
Base it on the record above, not on fear. The violations on this system’s history point at the contaminants worth filtering for; for everyday taste, a carbon filter does the job. Whatever you consider, match its NSF/ANSI certification to the specific job — and test your hardness before anyone sells you a softener.
Source: U.S. EPA SDWIS via Envirofacts, retrieved November 12, 2026. System-level data describes the utility’s water, not any individual tap. If your water bill names a different system, that system’s record is the one that applies to you.