Water Hardness in Vallejo, CA
California · 2 zip codes · 11 matched water systems
City avg (weighted): 169 PPM
Dataset updated March 9, 202611 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology
Is Vallejo, CA Water Hard or Soft?
The displayed hardness for Vallejo, CA is 160 PPM (9.3 GPG) from City Of Vallejo, classified as moderately hard. The citywide weighted average is 169 PPM.
Water hardness is not a drinking-water safety score. It measures calcium and magnesium minerals, and address-level results can shift by pressure zone, supply blend, building plumbing, or private well.
How this city reading is built
This city reading is a weighted rollup across 11 matched water systems and 2 ZIP codes. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.
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 in Vallejo
These systems are matched to Vallejo, CA. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
| City Of Vallejo CA4810007 | surface water | 160 PPM Moderately HardUSGS estimate: 81 PPM | |
| City Of Fairfield CA4810003 | surface water | 185 PPM HardUSGS estimate: 244 PPM | |
| City Of Vacaville CA4810008 | surface water | 150 PPM Moderately HardUSGS estimate: 244 PPM | |
| Suisun-Solano Water Authority CA4810005 | surface water | 170 PPM Moderately HardUSGS estimate: 259 PPM | |
| City Of Benicia CA4810001 | surface water | 70 PPM Slightly HardUSGS estimate: 422 PPM |
Zip Codes in Vallejo, CA
What This Means For You
Use this city 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.
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 Vallejo, CA.
Frequently Asked Questions
How hard is the water in Vallejo, CA?
The citywide weighted average water hardness in Vallejo, CA is 169 PPM (9.9 GPG), classified as moderately hard. This is based on 11 matched water systems. The gauge highlights City Of Vallejo, a verified treated-water system, because individual systems can differ from the citywide average.
Do I need a water softener in Vallejo, CA?
With a citywide average hardness of 169 PPM, a water softener is worth considering for homes in Vallejo. Confirm your tap reading before sizing equipment.
Is hard water in Vallejo, CA 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 Vallejo, CA?
Vallejo, California is served by 11 matched water systems across 2 zip codes.
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