How does San Jacinto's water compare to the national average?

The USA national average is 151 mg/L. San Jacinto (134 mg/L) is 17 mg/L softer than average.

San Jacinto Water Hardness & Quality Report (2026)

Water Hardness

134mg/L

Hard

7.8 grains per gallon

Source

groundwater

pH Level

8.3

neutral = 7.0

Lead

0.009 mg/L

✓ Below action level

TDS

599.4 mg/L

Est. Daily Cost

$0.36

energy & soap waste

Source: See methodology section below · Updated 2026

134mg/L as CaCO₃Hard

0–60

mg/L

Soft

61–120

mg/L

Moderately Hard

121–180

mg/L

Hard

180+

mg/L

Very Hard

Appliance Damage Report

In San Jacinto, your appliances are currently losing 18% efficiency due to mineral buildup.

Appliance	In San Jacinto	Soft Water City	Efficiency Loss
Kettle	5.2 yrs	8.5 yrs	-39%
Washing Machine	8.6 yrs	12 yrs	-28%
Water Heater	10.2 yrs	15 yrs	-32%

Regional Water Comparison

How San Jacinto compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ San Jacinto, California	134 mg/L	0 ppt	🟠 Hard	groundwater
Hemet, California	150 mg/L	0 ppt	🟠 Hard	groundwater
East Hemet, California	≈ 120–179 mg/L	6.1 ppt	🟠 Hard	mixed
Valle Vista, California	≈ 120–179 mg/L	3.2 ppt	🟠 Hard	mixed
Beaumont, California	≈ 180+ mg/L	0 ppt	🔴 Very Hard	groundwater

National Benchmark

How San Jacinto compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ San Jacinto	134 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes San Jacinto's Water Unique?

Local geology and source profile

Source: GroundwaterTDS: 599.4 mg/LpH: 8.3

The City of San Jacinto operates the municipal water utility serving approximately 50,000 residents in Riverside County, California. Water is sourced from a mix of local groundwater wells in the San Jacinto Valley and purchased surface water, primarily from the Metropolitan Water District via Eastern Municipal Water District connections. Treatment occurs at city facilities using disinfection including chloramines, hypochlorite, ozone, and UV light, as well as filtration and other processes to meet state standards. The watershed encompasses the San Jacinto River drainage and the enclosed San Jacinto Groundwater Basin, fed by precipitation and runoff from the San Jacinto Mountains.

The San Jacinto Groundwater Basin sits within the Peninsular Ranges, with aquifers comprising unconsolidated Quaternary alluvium and older Tertiary sedimentary formations, including the San Timoteo Formation, overlying fractured Mesozoic granitic and metamorphic bedrock of the Perris Block. These limestone-influenced alluvial deposits and carbonate-bearing sediments dissolve calcium and magnesium into the supply, producing a moderately mineralised character typical of Southern California basins, amplified by the region's arid climate and evaporative concentration.

Hard water in San Jacinto leads to scale buildup in pipes, heaters, and fixtures, reducing efficiency in water heaters, dishwashers, and washing machines while causing spots on glassware and dry skin from soap scum. Hot water appliances suffer most, with potential 20–30% energy loss from mineral insulation. Regular vinegar descaling, low-flow aerators, and magnetic conditioners help; a water softener is recommended for households to extend appliance life and improve cleaning. The 2022 Consumer Confidence Report shows pH balanced (Langelier Index 0.21), sodium 30 ppm, and compliance with primary standards; two contaminants exceeded EPA health guidelines including strontium, but no violations, and no PFAS or lead/copper violations were reported.

Geology & Source: San Jacinto Groundwater Basin, Peninsular Ranges; Quaternary alluvium and Tertiary San Timoteo Formation over Mesozoic granitic/metamorphic Perris Block — carbonate-bearing sediments dissolve calcium and magnesium, producing moderate hardness

Other California Water Reports

Hemet

150 mg/L

🟠 Hard

East Hemet

≈ 120–179 mg/L

🟠 Hard

Valle Vista

≈ 120–179 mg/L

🟠 Hard

Beaumont

≈ 180+ mg/L

🔴 Very Hard

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Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is San Jacinto's water safe to drink?

Yes. San Jacinto's water meets all federal safety standards. The hardness is 134 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in San Jacinto?

At 134 mg/L (Hard), San Jacinto's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 18%.

How does San Jacinto compare to the USA average?

The USA national average is 151 mg/L. San Jacinto (134 mg/L) is 17 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for San Jacinto is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

Water Hardness

Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

TDS — Total Dissolved Solids

Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.

Measured

PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances

EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.

Modelled

Lead

Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.

Calculated

Appliance Lifespan

Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.