Is McKinney, TX Tap Water Safe to Drink?
Yes, McKinney tap water is safe to drink. Hardness is low at 93 PPM, and no contaminants exceed health guidelines. Most homes here don't need treatment.
Hardness Scale: Where McKinney Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How McKinney Compares
McKinney's water is 33% softer than the national average of 138 PPM - ranking in the bottom 57% for hardness nationwide. Most homes here do not need a softener. Within Texas, it ranks #70 of 76 cities (51% below the state average of 189 PPM). Among large cities (200k-500k), McKinney ranks #92 of 165 for hardness.
What McKinney's Water Means for Your Home
Hardness: 93 PPM - Low Concern
McKinney's water is moderately hard at 93 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. A salt-free conditioner is worth considering if you have a tankless water heater or high-end fixtures.
Contaminants & Safety
Disinfection byproducts are the notable finding here. McKinney's water has TTHMs at 31.3 ppb and HAA5 at 19 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
McKinney's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 31.3 ppb (39% of the legal limit, but 209x the EWG guideline) and HAA5 at 19 ppb (32% of the legal limit, but 190x 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 0.0803 ppb, which is 4x 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) | 93 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 228 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 6.83 ppt | — | No total limit | Detected |
| ↳ PFOA | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| ↳ PFOS | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| Lead | 0.9 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 1.8 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 0.224 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Recommendations for McKinney Homes
Quick Fix for Chlorine: Shower Filter
At 1.8 mg/L chlorine, many McKinney residents notice dry skin, brittle hair, and that "pool smell" in the shower. A shower filter installs in 5 minutes, no tools needed.
How to Test Your Water in McKinney
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 McKinney's annual Consumer Confidence Report for official city-level data.
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About McKinney's Water Supply
Water Utility: City of McKinney
Water Source: North Texas MWD (Surface Water)
Population Served: 224,043
Hardness: 93 PPM (5.4 grains per gallon)
McKinney's drinking water comes from surface sources — North Texas MWD. 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 224,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request City of McKinney'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 McKinney in McKinney, TX, including ZIP codes:
73439, 74702, 74720, 74721, 74723, 74726, 74730, 74731, 74733, 74738, 74741, 74743, 74747, 74753, 74756, 74761, 75020, 75021, 75058, 75069, 75070, 75071, 75072, 75076, 75090, 75091, 75092, 75097, 75407, 75409, 75411, 75412, 75413, 75414, 75415, 75416, 75418, 75421, 75423, 75424, 75425, 75438, 75439, 75442, 75443, 75446, 75447, 75449, 75452, 75454, 75458, 75459, 75460, 75461, 75462, 75469, 75470, 75473, 75475, 75476, 75477, 75479, 75485, 75486, 75488, 75489, 75490, 75491, 75492, 75495, 75496, 76268
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare McKinney to Other Texas Cities
Frequently Asked Questions About McKinney Water
Is McKinney tap water safe to drink?
Where does McKinney's water come from?
Do I need a water softener in McKinney?
What is the hardness of McKinney water in grains per gallon?
What are disinfection byproducts in McKinney's water?
Is chromium-6 in McKinney's water?
Why does McKinney water taste like chlorine?
Can I drink McKinney tap water straight from the faucet?
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 McKinney Homeowners Actually Buy
Common purchases for homes with 93 PPM water.
Affiliate disclosure: we may earn a commission. Selection based on McKinney's water data.