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Water Hardness in 63703

Cape Girardeau, Missouri · Cape Girardeau County

262 PPM
15.3 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
2 USGS-backed sources
4 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.
Water source profile
Primarily groundwater
Groundwater commonly picks up calcium and magnesium after contact with rock and soil. 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 63703

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.
Cape Girardeau Pws
MO4010136
Hard
249 PPMgroundwater39,941 servedEstimated - Nearby Data
Jackson Pws
MO4010404
Very Hard
292 PPMgroundwater15,000 servedHigh Confidence - USGS Monitoring
Cape Girardeau County Pwsd 2
MO4024097
Very Hard
292 PPMgroundwater2,500 servedHigh Confidence - USGS Monitoring
Cape Girardeau County Pwsd 4
MO4024100
Hard
249 PPMgroundwater1,743 servedEstimated - County Avg

Nearby Zip Codes

637012616375810662957212637801346299021263742101637401296375526563736101629881456295214562969145

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 Cape Girardeau, MO (63703).

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Frequently Asked Questions

Is the water hard in Cape Girardeau, MO (63703)?

The average water hardness in 63703 is 262 PPM (15.3 GPG), which is classified as very hard.

Do I need a water softener in 63703?

With hardness of 262 PPM, a water softener is recommended for homes in 63703.

Is hard water in 63703 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 63703?

Zip code 63703 in Cape Girardeau, Missouri is served by 4 water systems.

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