Tempe, AZ
Tempe, AZ Water Softeners and Water Quality Guide
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Tempe's 2023 water quality report lists an average hardness of 10.9 grains per gallon (187 ppm), with a range of 9.5 to 29. Most of the city's water comes from the Salt and Verde rivers. We'll match you with up to 5 licensed Tempe water softener companies for free quotes.
- Average 10.9 gpg (range 9.5 to 29)
- About 71% SRP river water
- Options for condos and older homes
- Free to use, no obligation to hire
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Why does Tempe's water change through the year?
Tempe treats river water at two conventional surface water plants, Johnny G. Martinez and South Tempe, and supplements with wells. The city's water FAQ explains that the mix changes seasonally and from year to year, depending on precipitation and snowmelt runoff in the mountains.
The two rivers aren't the same, either. According to Tempe, the Verde River is higher in hardness, while the Salt River is higher in total dissolved solids and chlorides. As the blend shifts, you may notice changes in spotting or taste. Tempe also points out that knowing your grains per gallon is how you properly set dishwashers and water softeners.
How hard is Tempe water? Sources and hardness
| Source (2023) | Share of supply |
|---|---|
| Salt River Project (Salt and Verde rivers) | About 71% |
| Groundwater (8 wells) | About 22% |
| Central Arizona Project (Colorado River) | About 7% |
City of Tempe 2023 Consumer Confidence and Water Quality Report.
That same report lists average hardness of 187 ppm (10.9 grains per gallon), with a range of 163 to 500 ppm (9.5 to 29 gpg). The high end of that range is unusual, so if your water seems harder than average, test it before setting a softener. Compare cities in the Phoenix water hardness guide.
Softeners in older Tempe homes, condos and rentals
Tempe has many established neighborhoods, plus newer infill homes, townhomes and condos. A few things to keep in mind:
- Older homes may not have a softener loop, so water softener installation may involve some new plumbing.
- Condos and townhomes may have limited space or HOA rules. A compact softener or an under-sink reverse osmosis system may be the practical choice.
- Rentals: if you rent, talk to your landlord before adding equipment. RO units are less invasive than whole-house systems.
Tempe's water FAQ is candid about treatment. It notes there is no primary or secondary drinking water standard for hardness, that people install systems for reasons like hardness deposits or chlorine taste, and that softeners are limited in what they can do. It also warns that home treatment devices can cause water quality problems if they aren't maintained, so plan for upkeep before you buy.
Tempe water softener cost: whole house vs. drinking water only
Tempe homeowners often have a choice to make between treating the whole house and treating only drinking water. Angi's Phoenix-area figures put a single-tank softener at $550 to $2,000 and an under-sink reverse osmosis system at $1,100 to $1,800.
In condos and older homes without a loop, the plumbing can cost more than the softener. Get both options quoted if space is tight, and see the water softener cost guide for added costs.
Softener, RO or both? Get matched with licensed Tempe companies for a free quote.
Get My Free QuotesSalt-free options and nearby cities
Wondering about salt-free options? Our page on salt-free water conditioners explains the trade-offs at Tempe's hardness. For comparison, Mesa reports separate zones, Chandler a 16.5 gpg average and Scottsdale ranges by area: see water softeners in Mesa, water softeners in Chandler and water softeners in Scottsdale.
Weighing a softener against a salt-free conditioner, a filter or RO? Our water treatment decision matrix compares them side by side.
Services for Tempe homeowners
Tempe water softener FAQs
What is Tempe's water hardness?
Tempe's 2023 Consumer Confidence Report lists an average of 187 ppm, or 10.9 grains per gallon, with a range of 163 to 500 ppm (9.5 to 29 gpg). That average sits right at the start of the very hard range. Test your own tap for an exact setting.
Is Tempe water harder than Mesa or Chandler?
On average, a bit softer. Tempe's 2023 report lists a 10.9 gpg average, while Mesa reports about 12 gpg in its City Zone and 16 in its eastern and southern zones, and Chandler reports a 16.5 gpg citywide average. Tempe's range still reaches 29 gpg, so some homes may see much harder water than the average.
Why does my Tempe water taste different sometimes?
Tempe's water mix changes with the seasons and yearly runoff. The Salt River runs higher in dissolved solids and chlorides, while the Verde is higher in hardness. As the blend shifts between SRP, CAP and wells, taste and spotting can change too. RO at the kitchen sink smooths this out.
Can I put a water softener in a Tempe condo?
Sometimes. It depends on available space near the main line, a drain for the brine rinse, and your HOA or building rules. Compact softeners exist, but many condo owners choose an under-sink RO system for drinking water instead because it fits in a kitchen cabinet. A local pro can check what fits your unit.
How much of Tempe's water is groundwater?
About 22 percent in 2023, from eight city wells, according to Tempe's report. Salt River Project surface water supplied about 71 percent and Colorado River water from CAP about 7 percent. Because groundwater can differ in minerals from treated river water, the share of well water is one reason Tempe's hardness range is so wide.
Is there a legal limit on hardness in Tempe's water?
No. Tempe's water FAQ notes there is no primary or secondary drinking water standard for hardness, so the city doesn't treat it as a health issue. Residents who install softeners usually do it to cut scale and spotting. Tempe suggests knowing your grains per gallon so you can set dishwashers and softeners correctly.
Neighborhoods and ZIP codes we cover in Tempe
Homeowners in every part of Tempe can request a free water softener quote match. Enter your ZIP code on the form and we match you with a licensed local company that serves your area.
Tempe neighborhoods and communities
- The Lakes
- Warner Ranch
- Maple Ash
- University Park
- Lindon Park
- Alameda Estates
- Optimist Park
- Broadmor
- Rio Salado
- Raintree
- Tempe Royal Palms
- Papago Park Village
- Riverside
- Shalimar
- Sierra Tempe
- Tally Ho Farms
- Hudson Manor
- Cavalier Hills
- Corona Del Sol Estates
- Escalante
- Mission Ridge
- Carver Terrace
- Date Palm Manor
- University Heights
Tempe ZIP codes
85281 · 85282 · 85283 · 85284 · 85288 · 85287
Phoenix-area cities we serve
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Get My Free QuotesSources
- City of Tempe 2023 Consumer Confidence and Water Quality Report
- City of Tempe Water FAQ
- Angi: Water Softener Installation Cost in Phoenix, AZ
- University of Nebraska-Lincoln Extension G2275: Drinking Water Treatment: Water Softening
- City of Mesa 2025 Water Quality Report
- City of Chandler Water Quality FAQs
Last updated October 2026.