How does Pacific Grove's water compare to the national average?

The USA national average is 151 mg/L. Pacific Grove (164 mg/L) is 13 mg/L harder than average.

Pacific Grove Water Hardness & Quality Report (2026)

Water Hardness

164mg/L

Hard

9.6 grains per gallon

Source

mixed

pH Level

7.7

neutral = 7.0

Lead

0.005 mg/L

✓ Below action level

TDS

251.4 mg/L

Est. Daily Cost

$0.44

energy & soap waste

Source: See methodology section below · Updated 2026

164mg/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 Pacific Grove, your appliances are currently losing 22% efficiency due to mineral buildup.

Appliance	In Pacific Grove	Soft Water City	Efficiency Loss
Kettle	4.2 yrs	8.5 yrs	-51%
Washing Machine	7.5 yrs	12 yrs	-38%
Water Heater	9 yrs	15 yrs	-40%

Regional Water Comparison

How Pacific Grove compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Pacific Grove, California	164 mg/L	111.8 ppt	🟠 Hard	mixed
Monterey, California	≈ 180+ mg/L	3.2 ppt	🔴 Very Hard	groundwater
Seaside, California	≈ 180+ mg/L	6.4 ppt	🔴 Very Hard	groundwater
Marina, California	124 mg/L	0 ppt	🟠 Hard	groundwater
Salinas, California	254 mg/L	0 ppt	🔴 Very Hard	groundwater

National Benchmark

How Pacific Grove compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Pacific Grove	164 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

Bring Scarsdale-quality water to your Pacific Grove home

Shop water softeners on Amazon.com →

Shop Now

What Makes Pacific Grove's Water Unique?

Local geology and source profile

Source: MixedTDS: 251.4 mg/LpH: 7.7

California American Water Company (Cal Am) serves Pacific Grove, drawing water from the Carmel River watershed and groundwater aquifers, including the Seaside Groundwater Basin. Surface water originates from the Carmel River and Santa Lucia Highlands reservoirs. Groundwater comes from the Carmel Valley Alluvial Aquifer and the Seaside Groundwater Basin. Treated at the San Pablo Water Treatment Plant and blending facilities, this supply supports about 40,000 residents.

The water's journey begins in the Santa Lucia Mountains, where the Carmel River flows through granite and sedimentary rock. As water percolates through soils and fractured bedrock, it picks up minerals. This geology, characterized by Mesozoic granitic intrusions and Quaternary alluvium, naturally dissolves alkaline earth metals, resulting in a hard water profile typical of coastal California.

Homeowners in Pacific Grove may notice moderate scale buildup in appliances like water heaters and dishwashers, potentially shortening their lifespan and reducing efficiency. Laundry might feel stiff, and soap scum can be a common sight on bathroom fixtures. To combat this, consider annual deliming of heating elements or using scale inhibitors. For persistent spotting on glassware or a film on the skin after showering, installing a whole-house water softener is often recommended.

Geology & Source: Salinian Block granitic bedrock; limestone-poor alluvial deposits; dissolved calcium and magnesium ions

Other California Water Reports

Monterey

≈ 180+ mg/L

🔴 Very Hard

Seaside

≈ 180+ mg/L

🔴 Very Hard

Marina

124 mg/L

🟠 Hard

Salinas

254 mg/L

🔴 Very Hard

Report an Issue

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 Pacific Grove's water safe to drink?

Yes. Pacific Grove's water meets all federal safety standards. The hardness is 164 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 Pacific Grove?

At 164 mg/L (Hard), Pacific Grove'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 22%.

How does Pacific Grove compare to the USA average?

The USA national average is 151 mg/L. Pacific Grove (164 mg/L) is 13 mg/L above the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Pacific Grove 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.