Main System
TX101001390.3% surface water and 9.7% groundwater in the 2025 report.
PWS-level water intelligence
Houston Water Quality by Public Water System
Review Houston water hardness, TDS, pH, and source context by public water system, with official 2025 report links and clear evidence limits.
✓ Official sources✓ System-specific✓ No invented city averages
Evidence status
Coverage model: Multi-PWS city
Match the utility and public water system ID before applying a report value to a property.
Measurements publishedHouston Public Works reports six separate public water systems. The Main System result is useful context, but it is not a valid citywide number for every Houston address.
System resolution
Which water system applies?
Kingwood
TX1010348Groundwater system.
Willow Chase
TX1011902Groundwater system.
District 73
TX1011585Groundwater system.
District 82
TX1011593Groundwater system; some reduced-monitoring values predate the report year.
Belleau Woods
TX1011594Purchased water from the City of Humble.
Measured facts
Published measurements
43.5–229 ppm as CaCO3 in the 2025 report; about 7.9 gpg average and 2.5–13.4 gpg range.
Main System secondary-standard result.
Main System secondary-standard result.
Main System secondary-standard result.
LADS interpretation
What the evidence means—and does not mean
- The Main System average falls in a commonly described moderately hard range, while its reported samples span a much wider range.
- Hardness and total dissolved solids are operational and aesthetic context, not a safety verdict.
- Use a current untreated-tap test before sizing a softener or attributing a household symptom to the utility.
Measured fact
Values above stay tied to their named system, units, sample or report year, and official source.
Publisher interpretationPlanning language is educational context. It is not an official safety determination, diagnosis, ranking, or equipment prescription.
Primary evidence
Official sources
Evidence before equipment