Is Spokane, WA Tap Water Safe to Drink?
Spokane tap water is legally compliant, but one contaminant exceeds health guidelines. Specifically: PFAS above EPA limits (PFOS: 6.1 ppt — limit is 4 ppt each). A point-of-use filter is recommended for drinking and cooking water.
Hardness Scale: Where Spokane Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Spokane Compares
Spokane's water is 25% softer than the national average of 138 PPM - ranking in the bottom 56% for hardness nationwide. Most homes here do not need a softener. Within Washington, Spokane has the hardest water out of 26 cities - 215% above the state average of 33 PPM. Among large cities (200k-500k), Spokane ranks #89 of 165 for hardness.
What Spokane's Water Means for Your Home
Hardness: 104 PPM - Low Concern
Spokane's water is firmly in the moderate range at 104 PPM. You'll see some spotting on glassware and a film on shower doors over time, but it's not the kind of hardness that demands a full softener. The minerals come from the local aquifer geology. A salt-free conditioner is worth considering if you have a tankless water heater or high-end fixtures.
Contaminants & Safety
Forever chemicals (PFAS) are worth watching here. Spokane has PFOS at 6.1 ppt, exceeding the EPA's 2024 limit of 4 ppt per compound. PFAS are synthetic compounds that accumulate in your body over time. A certified carbon filter or reverse osmosis system with NSF P473 certification is the most effective protection. See the regulatory timeline.
What's in the Treatment Process
Chromium-6 is naturally present in Spokane's aquifer geology at 0.26 ppb — 13x the EWG health guideline. There's no federal legal limit for chromium-6 specifically (only total chromium), which is why EWG tracks it separately. All measurements are within federal legal limits. The EWG guidelines represent a more conservative, health-based standard.
| Contaminant | Detected | Health Guideline | Legal Limit | Status |
|---|---|---|---|---|
| Hardness (as CaCO₃) | 104 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 156 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 16.8 ppt | — | No total limit | Detected |
| ↳ PFOA | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| ↳ PFOS | 6.1 ppt | 0 ppt | 4 ppt (2024) | ⚠ Exceeds |
| Lead | 2 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 0.7 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 1.72 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Recommendations for Spokane Homes
Recommended Filter for Spokane
PFAS exceed EPA limits (PFOS: 6.1 ppt — limit: 4 ppt each). A certified filter reduces these contaminants effectively.
How to Test Your Water in Spokane
With PFAS at 16.8 ppt in Spokane's supply, confirming your home's specific levels is especially important. PFAS vary by neighborhood and can concentrate differently depending on your position in the distribution system.
Free option: Request City of Spokane's annual Consumer Confidence Report for official city-level data.
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About Spokane's Water Supply
Water Utility: City of Spokane
Water Source: Spokane-Rathdrum Aquifer (Groundwater)
Population Served: 343,167
Hardness: 104 PPM (6.1 grains per gallon)
Spokane draws its drinking water from groundwater sources — Spokane-Rathdrum Aquifer. Groundwater typically requires less treatment than surface water because the earth acts as a natural filter. The tradeoff: dissolved minerals from underground rock formations, which is why mineral content varies by aquifer depth and geology. The geological profile determines hardness, iron, and trace mineral levels. The system serves 343,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request City of Spokane's Consumer Confidence Report (CCR) or test your own tap.
ZIP Codes Covered by This Report
This water quality data applies to all areas served by City of Spokane in Spokane, WA, including ZIP codes:
98859, 99001, 99003, 99004, 99005, 99006, 99008, 99009, 99011, 99012, 99013, 99014, 99016, 99017, 99018, 99020, 99021, 99022, 99023, 99026, 99029, 99030, 99031, 99032, 99033, 99034, 99036, 99037, 99039, 99040, 99101, 99103, 99104, 99107, 99109, 99110, 99114, 99116, 99117, 99118, 99119, 99121, 99122, 99124, 99125, 99126, 99128, 99129, 99131, 99134, 99137, 99138, 99139, 99140, 99141, 99144, 99146, 99147, 99148, 99149, 99150, 99151, 99152, 99153, 99154, 99157, 99158, 99159, 99160, 99166, 99167, 99169, 99170, 99171, 99173, 99174, 99176, 99180, 99181, 99185, 99201, 99202, 99203, 99204, 99205, 99206, 99207, 99208, 99209, 99210, 99211, 99212, 99213, 99214, 99215, 99216, 99217, 99218, 99219, 99220, 99223, 99224, 99228, 99251, 99252, 99256, 99258, 99260
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Spokane to Other Washington Cities
Frequently Asked Questions About Spokane Water
Is Spokane tap water safe to drink?
Where does Spokane's water come from?
Do I need a water softener in Spokane?
How do I remove PFAS from Spokane tap water?
What water filter is best for Spokane?
Is Spokane water safe for babies and infants?
What is the hardness of Spokane water in grains per gallon?
What are disinfection byproducts in Spokane's water?
Data sources: Lead and copper data from EPA Safe Drinking Water Act LCR reporting. Contaminant data from utility-reported testing results. PFAS data from EPA UCMR5 (2023–2025). Hardness from USGS and municipal reports. Data reflects system-level testing results and may not match your specific tap due to neighborhood plumbing, season, or recent utility changes. For your utility's latest results, request their Consumer Confidence Report (CCR). Our methodology. Last updated: 2026-02-24.
What Spokane Homeowners Actually Buy
Prioritized for contaminant reduction for homes with 104 PPM water and PFAS above EPA limits.
Affiliate disclosure: we may earn a commission. Selection based on Spokane's water data.