How does Green Valley's water compare to the national average?

The USA national average is 151 mg/L. Green Valley (≈ 180+ mg/L) is 189 mg/L harder than average.

Green Valley Water Hardness & Quality Report (2026)

Water Hardness

very hard

180+ mg/L

Very Hard

estimated · not lab-verified

Source

groundwater

pH Level

7.8

neutral = 7.0

Lead

0.001 mg/L

✓ Below action level

TDS

300.6 mg/L

Est. Daily Cost

$0.91

energy & soap waste

Source: See methodology section below · Updated 2026

very hard180+ mg/LVery Hard · 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 Green Valley, your appliances are currently losing 45% efficiency due to mineral buildup.

Appliance	In Green Valley	Soft Water City	Efficiency Loss
Kettle	4.7 yrs	8.5 yrs	-45%
Washing Machine	6.6 yrs	12 yrs	-45%
Water Heater	8.3 yrs	15 yrs	-45%

Regional Water Comparison

How Green Valley compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Green Valley, Arizona	≈ 180+ mg/L	0 ppt	🔴 Very Hard	groundwater
Sahuarita, Arizona	≈ 180+ mg/L	0 ppt	🔴 Very Hard	groundwater
Drexel Heights, Arizona	≈ 180+ mg/L	4.6 ppt	🔴 Very Hard	mixed
Vail, Arizona	≈ 120–179 mg/L	0 ppt	🟠 Hard	groundwater
Tucson Estates, Arizona	≈ 180+ mg/L	8.1 ppt	🔴 Very Hard	groundwater

National Benchmark

How Green Valley compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Green Valley	≈ 180+ mg/L	🔴 High
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Green Valley's Water Unique?

Local geology and source profile

Source: GroundwaterTDS: 300.6 mg/LpH: 7.8

Community Water Company of Green Valley, located at 1501 S La Canada Drive, Green Valley, AZ 85622, serves approximately 21,000 residents in the Green Valley area of Pima County, Arizona. The utility draws exclusively from deep groundwater wells characteristic of Southern Arizona's desert aquifers, with no surface water reservoirs or rivers utilized. Standard groundwater processing is applied to meet federal and state standards. Contact: 520-625-8409 or communitywater.com.

The supply originates within the Santa Cruz River watershed in the Basin and Range physiographic province, where groundwater is extracted from confined aquifers beneath the Sonoita Valley and adjacent alluvial basins. Key rock formations include Tertiary volcanics, Quaternary caliche soils, and underlying Paleozoic limestones — the Abrigo and Martin Formations — which contribute to the water's very hard character through natural dissolution of calcium and magnesium-bearing minerals. The arid desert geology yields a highly mineralised supply with elevated total dissolved solids, naturally occurring radioactive elements from granitic intrusions, and traces of heavy metals leached over millennia.

Very hard water in Green Valley causes significant limescale buildup in pipes, water heaters, dishwashers, washing machines, and faucets, leading to reduced efficiency, higher energy bills, and potential premature appliance failure. Showers leave soap scum and dry skin; laundry requires excess detergent. Regular vinegar descaling, drain screens, and biannual water heater flushing are recommended; a water softener is strongly recommended and often essential for homes to protect plumbing and extend appliance life. The 2024 Consumer Confidence Report confirms compliance with all primary federal and state standards; sodium ranged 41–71 mg/L and post-treatment hardness 3.6–6.3 GPG. Seven contaminants — including arsenic, hexavalent chromium, and radium from natural geology — exceed health advocacy guidelines per third-party analysis, though below legal MCLs.

Geology & Source: Basin and Range Province deep groundwater wells; Tertiary volcanics, Quaternary caliche, Paleozoic Abrigo and Martin Formation limestones — arid climate concentrates minerals yielding very hard water

Other Arizona Water Reports

Sahuarita

≈ 180+ mg/L

🔴 Very Hard

Drexel Heights

≈ 180+ mg/L

🔴 Very Hard

Vail

≈ 120–179 mg/L

🟠 Hard

Tucson Estates

≈ 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 Green Valley's water safe to drink?

Yes. Green Valley's water meets all federal safety standards. The hardness is ≈ 180+ mg/L (Very Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Green Valley?

At ≈ 180+ mg/L (Very Hard), Green Valley'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 45%.

How does Green Valley compare to the USA average?

The USA national average is 151 mg/L. Green Valley (≈ 180+ mg/L) is 189 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 Green Valley 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.