WH

Water Hardness in 65043

Holts Summit, Missouri · Callaway County

302 PPM
17.7 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 65043

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.
Callaway 2 Water District
MO3024085
Very Hard
285 PPMgroundwater13,080 servedEstimated - Nearby Data
Fulton Pws
MO3010296
Very Hard
285 PPMgroundwater12,600 servedEstimated - Nearby Data
Callaway County Pwsd 1
MO3024084
Very Hard
347 PPMgroundwater9,840 servedHigh Confidence - USGS Monitoring
Doolittle Mhp
MO3048097
Very Hard
347 PPMgroundwater100 servedHigh Confidence - USGS Monitoring

Nearby Zip Codes

650802856506328765101120651091206501634765039120650592866505434765010123650853476505312065023122

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 Holts Summit, MO (65043).

Submit Your Data

Frequently Asked Questions

Is the water hard in Holts Summit, MO (65043)?

The average water hardness in 65043 is 302 PPM (17.7 GPG), which is classified as very hard.

Do I need a water softener in 65043?

With hardness of 302 PPM, a water softener is recommended for homes in 65043.

Is hard water in 65043 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 65043?

Zip code 65043 in Holts Summit, Missouri is served by 4 water systems.

Learn More About Your Water

How to Test Water Hardness at Home

Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.

8 min read

Water Hardness Scale: PPM and GPG Chart

Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.

10 min read

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

Well water is almost always harder than city water. Learn why, how to test your well, and the best treatment options for hard well water.

8 min read