Agua Caliente Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

mixed

pH Level

7.2

neutral = 7.0

Lead

0.001 mg/L

✓ Below action level

TDS

58.4 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · est.

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 Agua Caliente, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Agua Caliente	Soft Water City	Efficiency Loss
Kettle	6.8 yrs	8.5 yrs	-20%
Washing Machine	9.6 yrs	12 yrs	-20%
Water Heater	12 yrs	15 yrs	-20%

Regional Water Comparison

How Agua Caliente compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Agua Caliente, California	≈ 120–179 mg/L	2.9 ppt	🟠 Hard	mixed
Sonoma, California	≈ 120–179 mg/L	20.6 ppt	🟠 Hard	groundwater
Petaluma, California	≈ 0–60 mg/L	0 ppt	🟢 Soft	groundwater
Napa, California	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Rohnert Park, California	≈ 180+ mg/L	13.8 ppt	🔴 Very Hard	groundwater

National Benchmark

How Agua Caliente compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Agua Caliente	≈ 120–179 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Agua Caliente's Water Unique?

Local geology and source profile

Source: MixedTDS: 58.4 mg/LpH: 7.2

The Agua Caliente Water Authority serves the Agua Caliente Band of Cahuilla Indians' Reservation in Palm Springs, California, within Riverside County. The primary water supply is groundwater extracted from the Coachella Valley groundwater basin. There are no named surface reservoirs or rivers directly supplying the utility; instead, production wells tap into the reservation's reserved groundwater rights, confirmed at 20,000 acre-feet per year under recent settlements with the Coachella Valley Water District (CVWD) and Desert Water Agency (DWA). Treatment involves standard groundwater processes with delivery infrastructure shared in coordination with neighboring districts.

The Coachella Valley watershed drains from the San Jacinto and Santa Rosa Mountains into the Salton Sea basin, where groundwater resides in the extensive Coachella Valley aquifer — a thick alluvial fill of Quaternary sands, gravels, and silts overlying older Miocene to Pliocene sedimentary rocks. These formations, including evaporitic and carbonate layers, contribute dissolved minerals as water interacts with limestone and dolomite equivalents. The region's tectonically active geology, shaped by the San Andreas Fault system, results in a hard groundwater supply due to elevated dissolved calcium and magnesium from prolonged contact with carbonate-rich rocks.

At hard levels, scale buildup is significant, accelerating wear on water heaters, dishwashers, washing machines, and faucets, while reducing soap efficiency and leaving spots on dishes and fixtures. Boilers and pipes face reduced lifespan from mineral deposits. Regular maintenance like deliming appliances, installing sediment filters, and flushing systems is advised; a water softener is recommended to mitigate these effects and extend equipment life. Groundwater typically falls in a neutral to slightly alkaline pH range. The utility regulates groundwater under tribal ordinance, with settlements ensuring quality standards alignment; treatment coordinates with CVWD/DWA infrastructure and includes disinfection and filtration per EPA rules.

Geology & Source: Coachella Valley groundwater basin, Riverside County — thick Quaternary alluvium and Miocene to Pliocene sedimentary formations over carbonate and evaporitic layers from San Jacinto Mountains; limestone and dolomite dissolution yields hard

Other California Water Reports

Sonoma

≈ 120–179 mg/L

🟠 Hard

Petaluma

≈ 0–60 mg/L

🟢 Soft

Napa

≈ 120–179 mg/L

🟠 Hard

Rohnert Park

≈ 180+ 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 Agua Caliente's water safe to drink?

Yes. Agua Caliente's water meets all federal safety standards. The hardness is ≈ 120–179 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 Agua Caliente?

At ≈ 120–179 mg/L (Hard), Agua Caliente'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 20%.

How does Agua Caliente compare to the USA average?

The USA national average is 151 mg/L. Agua Caliente (≈ 120–179 mg/L) is 1 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 Agua Caliente 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.