Wentzville city wells
17.3 grains per gallon
296 mg/L. Very hard.
One sample, taken 3/20/2023.
Sodium 44.5 mg/L. Total dissolved solids 414 mg/L.
Water hardness in Wentzville, Missouri
Wentzville's city wells tested at 17.3 grains per gallon in the city's 2025 water quality report, which the U.S. Geological Survey classes as very hard. Water the city buys from PWSD 2 runs 8.3 to 10.8 grains per gallon. Your number depends on which source feeds your street.
Who supplies water in Wentzville
Wentzville homes get water from the city's own wells, from water the city buys from PWSD 2, or a mix of the two. Which one reaches your tap depends on your street.
Public Water Supply District 2 of St. Charles County (PWSD 2)
8.3 to 10.8 grains per gallon
142 to 184 mg/L. Hard to very hard.
Range across the district's sources.
Serves about 100,000 people. It also sells water to Wentzville and O'Fallon.
Most city water in St. Charles County is hard or very hard
Hardness in grains per gallon, from each utility's 2025 water quality report
- Soft, 0 to 3.5
- Moderately hard, 3.5 to 7
- Hard, 7 to 10.5
- Very hard, over 10.5
- Wentzville (city wells)17.3 gpg
- O'Fallon (city system)7.2 to 16.5 gpg
- PWSD 28.3 to 10.8 gpg
- St. Peters10.1 gpg
- St. Charles (city)8.9 gpg
- Missouri American Waterabout 5 to 7 gpg calculated
Sources: City of Wentzville 2025 water quality report and PWSD 2 2025 water quality report.
What that means at home
At this hardness, scale builds up in water heaters and on fixtures, and soap does not lather well. None of that is a health risk. It is wear on the house and more cleaning.
What we would look at
A test at your tap comes first. It tells us your real hardness and whether your water carries chlorine or chloramine. From there, the usual options are a water softener for scale, a carbon filter for taste and smell, and reverse osmosis for drinking water. Sometimes the answer is none of them.
Common questions
How hard is the water in Wentzville?
Wentzville's city wells tested at 17.3 grains per gallon in the city's 2025 water quality report, which the U.S. Geological Survey classes as very hard. Water the city buys from PWSD 2 runs 8.3 to 10.8 grains per gallon. Your number depends on which source feeds your street.
Who provides water in Wentzville?
Wentzville homes get water from the city's own wells, from water the city buys from PWSD 2, or a mix of the two. Which one reaches your tap depends on your street.
Do you serve Wentzville?
Yes. We are based in Wentzville and serve homes on city water across St. Charles County.
Figures for Wentzville are from City of Wentzville 2025 water quality report and PWSD 2 2025 water quality report, as published on the Missouri Department of Natural Resources website, read on October 27, 2026. Most hardness results are 2023 samples reprinted in the 2025 reports. Last reviewed November 10, 2026.
Find out how hard your water is.
The test is free, it takes place at your kitchen sink, and you see the numbers yourself.