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Water Hardness in 49270

Petersburg, Michigan · Monroe County

279 PPM
16.3 GPG
Very Hard
0Soft60120180300+
High Confidence - USGS Monitoring

Dataset updated March 9, 2026Matched to 4 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 4 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis
3 USGS-backed sources
4 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.
Water source profile
Primarily surface water
Surface-water hardness can shift with reservoirs, runoff, season, and treatment. This profile is weighted by known population served across matched systems.
Data recency
March 9, 2026
Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.

Water Systems Serving 49270

These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.

4 water systems
PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.
Monroe
MI0004450
Very Hard
279 PPMsurface water49,467 servedHigh Confidence - USGS Monitoring
Monroe South County
MI0004455
Very Hard
279 PPMsurface water33,816 servedHigh Confidence - USGS Monitoring
Frenchtown Township
MI0002500
Very Hard
279 PPMsurface water16,481 servedHigh Confidence - USGS Monitoring
Petersburg
MI0005290
Very Hard
279 PPMsurface water1,115 servedEstimated - Nearby Data

Nearby Zip Codes

48140279492383344813127949276336481822794926727948144279492293374922831848161279481452794362317

What This Means For You

Use this ZIP reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.

MethodologyData sourcesHow to test your water

Know your water hardness?

If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Petersburg, MI (49270).

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Frequently Asked Questions

Is the water hard in Petersburg, MI (49270)?

The average water hardness in 49270 is 279 PPM (16.3 GPG), which is classified as very hard.

Do I need a water softener in 49270?

With hardness of 279 PPM, a water softener is recommended for homes in 49270.

Is hard water in 49270 safe to drink?

Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.

How many water systems serve 49270?

Zip code 49270 in Petersburg, Michigan is served by 4 water systems.

Learn More About Your Water

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Well Water Hardness: Why It's Usually Hard & How to Treat It

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