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Water Hardness in 78636

Johnson City, Texas · Blanco County

963 PPM
56.3 GPG
Very Hard
0Soft60120180300+
High Confidence - USGS Monitoring

Dataset updated March 9, 2026Matched to 2 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 2 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
2 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 78636

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.

2 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.
City Of Johnson City
TX0160001
Very Hard
963 PPMgroundwater2,097 servedHigh Confidence - USGS Monitoring
Stonegate Subdivision Water System
TX0160014
Very Hard
963 PPMgroundwater63 servedHigh Confidence - USGS Monitoring

Nearby Zip Codes

78663185786351857867196378657179786067478620160786759637866912078654443787381207863918578624963

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 Johnson City, TX (78636).

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Frequently Asked Questions

Is the water hard in Johnson City, TX (78636)?

The average water hardness in 78636 is 963 PPM (56.3 GPG), which is classified as very hard.

Do I need a water softener in 78636?

With hardness of 963 PPM, a water softener is recommended for homes in 78636.

Is hard water in 78636 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 78636?

Zip code 78636 in Johnson City, Texas is served by 2 water systems.

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