The Complete Guide to El Paso Water
El Paso tap water typically tests around 12 to 15 grains per gallon hard. Hardness varies by water source and location, so an individual home can test differently.
How hard is El Paso water?
Hardness is measured in grains per gallon (GPG) or milligrams per liter (mg/L) as calcium carbonate. 1 grain per gallon is about 17.1 mg/L.
| Hardness | mg/L as CaCO₃ |
|---|---|
| 12 GPG | ≈ 205 mg/L |
| 15 GPG | ≈ 257 mg/L |
Both fall in the range commonly described as "very hard" (above about 180 mg/L by the U.S. Geological Survey scale). Our own tap measurements across El Paso and the Lower Valley typically land in this range. El Paso Water publishes a lower citywide average that blends all sources and zones, which is why individual homes can read higher or lower.
Want your home's numbers? Look up your utility's water report by ZIP code, or read how hard El Paso water is and more about El Paso hard water.
Is El Paso water safe?
El Paso municipal water is regulated under federal drinking-water standards. Hardness itself is primarily a nuisance and aesthetic issue, not a reason to claim the city's water is unsafe.
Some organizations, such as the Environmental Working Group (EWG), publish health guidelines that are stricter than federal limits. An EWG health guideline is not the same as an EPA legal limit, and exceeding an EWG guideline does not mean a utility is violating federal drinking-water standards.
What hard water causes
- Scale on fixtures
- Shower-door deposits
- Spotted dishes
- Reduced soap lather
- Mineral accumulation in water heaters and appliances
- Scale in plumbing fixtures
What treatment does what?
| Problem | Treatment |
|---|---|
| Hardness/scale | Ion-exchange water softener |
| Chlorine/taste/odor | Activated carbon |
| Dissolved solids | Reverse osmosis |
| Fluoride | Reverse osmosis |
| Arsenic at drinking tap | Properly specified reverse osmosis |
| Nitrate/nitrite | Properly specified reverse osmosis |
| Sediment | Sediment filtration |
| Well-water iron | Iron-specific treatment after testing |
| Rotten-egg sulfur odor | Oxidation/catalytic filtration after testing |
| Well-water bacteria | Test first; treatment/disinfection depends on result |
Reverse osmosis is point-of-use treatment, usually installed under the kitchen sink for drinking and cooking water. Well water should be tested before choosing treatment.
What we recommend for most El Paso city-water homes
Most city-water customers primarily want three things addressed: hardness throughout the home, chlorine/taste/odor throughout the home, and better drinking and cooking water at the kitchen sink.
That is why our most common setup combines:
- Ion-exchange softening
- Coconut-shell activated carbon
- Under-sink reverse osmosis
See how that is built in what makes a good water softener, what it costs in the El Paso cost guide, or every spec on the Systems page.
Know your water. Then decide.
Look up your water report, or get our installed price.