Is Yakima, WA Tap Water Safe to Drink?
Yes, Yakima tap water is safe to drink. Hardness is low at 25 PPM, and no contaminants exceed health guidelines. Most homes here don't need treatment.
Hardness Scale: Where Yakima Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Yakima Compares
Yakima's water is 82% softer than the national average of 138 PPM - ranking in the bottom 86% for hardness nationwide. Most homes here do not need a softener. Within Washington, it ranks #8 of 26 cities (24% below the state average of 33 PPM). Among mid-size cities (100k-200k), Yakima ranks #164 of 189 for hardness.
What Yakima's Water Means for Your Home
Hardness: 25 PPM - Low Concern
Yakima's water is slightly hard at 25 PPM. Most households won't notice any issues at this level. Scale buildup is minimal, and a water softener would be overkill. Yakima is softer than 86% of US cities. If you're thinking about water treatment, contaminant filtration is where to focus your money, not softening.
Contaminants & Safety
Disinfection byproducts are the notable finding here. Yakima's water has TTHMs at 30.1 ppb and HAA5 at 27.3 ppb — both within legal limits, but the EWG health guidelines are far stricter. These byproducts form when chlorine reacts with organic matter during treatment. A whole-house activated carbon filter reduces both chlorine and its byproducts. Want the full picture? Request your utility's annual Consumer Confidence Report.
What's in the Treatment Process
Yakima's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 30.1 ppb (38% of the legal limit, but 201x the EWG guideline) and HAA5 at 27.3 ppb (46% of the legal limit, but 273x the EWG guideline). These are within legal limits, but the EWG sets much tighter thresholds based on cancer-risk research. A whole-house activated carbon filter reduces both chlorine and byproducts.
Chromium-6 was detected at 0.979 ppb, which is 49x the EWG health guideline. There's no separate federal limit for chromium-6, only total chromium. A reverse osmosis system is the most effective removal method. 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) | 25 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 37 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 0 ppt | — | No total limit | ✓ ND |
| ↳ PFOA | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| ↳ PFOS | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| Lead | 0.6 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 0.9 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 0.262 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Good news for Yakima residents. Your water quality is generally good. Most homes in this area do not need a water softener. If you have concerns about lead (especially in buildings constructed before 1986) or chlorine taste, a point-of-use filter is the most practical and cost-effective solution.
How to Test Your Water in Yakima
City-wide data is a solid starting point, but your specific tap might differ based on plumbing age, distance from the treatment plant, or seasonal changes.
Free option: Request City of Yakima Water Division's annual Consumer Confidence Report for official city-level data.
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About Yakima's Water Supply
Water Utility: City of Yakima Water Division
Water Source: Naches River, wells (Surface Water)
Population Served: 112,858
Hardness: 25 PPM (1.5 grains per gallon)
Yakima's drinking water comes from surface sources — Naches River, wells. Surface water requires more extensive treatment than groundwater, including coagulation, filtration, and disinfection. This heavier chlorination is why disinfection byproducts tend to be higher in surface-supplied systems. On the upside, surface sources often deliver softer water than deep aquifers. The system serves 113,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request City of Yakima Water Division'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 Yakima Water Division in Yakima, WA, including ZIP codes:
98901, 98902, 98903, 98904, 98907, 98908, 98909, 98920, 98921, 98923, 98926, 98932, 98933, 98934, 98936, 98937, 98938, 98939, 98942, 98944, 98947, 98948, 98950, 98951, 98952, 98953, 99321, 99349
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Yakima to Other Washington Cities
Frequently Asked Questions About Yakima Water
Is Yakima tap water safe to drink?
Where does Yakima's water come from?
Do I need a water softener in Yakima?
What are disinfection byproducts in Yakima's water?
Is chromium-6 in Yakima's water?
Can I drink Yakima tap water straight from the faucet?
What water filter is best for Yakima?
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.