Is Oklahoma City North, OK Tap Water Safe to Drink?
Yes, Oklahoma City North tap water is safe to drink. No contaminants exceed health guidelines. However, Oklahoma City North has very hard water at 200 PPM, which will cause scale buildup in plumbing and appliances over time. A water softener is worth considering.
Hardness Scale: Where Oklahoma City North Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Oklahoma City North Compares
Oklahoma City North's water is 45% harder than the national average of 138 PPM. It ranks #323 out of 1000 cities in our database (harder than 68% of US cities we track). Within Oklahoma, it ranks #9 of 14 cities (8% below the state average of 217 PPM). Among major US cities (500k+), Oklahoma City North ranks #30 of 100 for hardness. At this hardness level, water heaters run an estimated 37% less efficiently due to scale insulation, and major water-using appliances typically last 3 years less than the national average lifespan.
What Oklahoma City North's Water Means for Your Home
Hardness: 200 PPM - Treatment Recommended
Oklahoma City North has some seriously hard water. At 200 PPM (11.7 grains per gallon), your tap is loaded with mineral content carried in from the watershed geology. Here's the thing: it's perfectly safe to drink. The minerals won't hurt you. But they will hurt your wallet. That adds up. Hard water at 200 PPM increases household costs through scale-coated water heaters that use more energy, extra soap and detergent, and appliances that wear out faster. Most Oklahoma City North homeowners don't realize it until the plumber shows up. That's 8% softer than the Oklahoma average.
Contaminants & Safety
Disinfection byproducts are the notable finding here. Oklahoma City North's water has TTHMs at 54.7 ppb and HAA5 at 30.5 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
Oklahoma City North's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 54.7 ppb (68% of the legal limit, but 365x the EWG guideline) and HAA5 at 30.5 ppb (51% of the legal limit, but 305x 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 0.115 ppb, which is 5.7x 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.
How Hard Water Affects Your Home
At 200 PPM, untreated hard water has measurable effects on household costs and appliance life:
- Water heater inefficiency: Scale insulation forces the heater to work harder (DOE estimates up to 22% more energy for heavily scaled units)
- Soap and detergent: Hard water reduces lathering, requiring significantly more product
- Appliance replacement: Water heaters, dishwashers, and washing machines fail 2-4 years earlier due to scale buildup
- Plumbing maintenance: Scale buildup in pipes reduces flow and requires more frequent service
Note: Impact varies by household size, water usage, and local energy costs. A home water test provides the most accurate assessment for your specific situation.
| Contaminant | Detected | Health Guideline | Legal Limit | Status |
|---|---|---|---|---|
| Hardness (as CaCO₃) | 200 PPM | < 60 PPM | No federal limit | ⚠ Very Hard |
| Total Dissolved Solids | 330 PPM | < 300 PPM | 500 PPM | ⚠ Elevated |
| PFAS (total) | 3.7 ppt | — | No total limit | Detected |
| ↳ PFOA | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| ↳ PFOS | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| Lead | 4.1 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 1.4 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 0.233 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Recommendations for Oklahoma City North Homes
Our Top Picks for Oklahoma City North (200 PPM)
Hard water at 200 PPM causes scale buildup, increased energy use, and premature appliance failure. A softener protects your plumbing and appliances.
Quick Fix for Chlorine: Shower Filter
At 1.4 mg/L chlorine, many Oklahoma City North 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 Oklahoma City North
With 200 PPM hardness, a quick test strip confirms whether your specific tap matches Oklahoma City North's average before you invest in a softener. Hardness can vary within the same system.
Free option: Request City of OKC Water's annual Consumer Confidence Report for official city-level data.
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About Oklahoma City North's Water Supply
Water Utility: City of OKC Water
Water Source: Lake Hefner + Lake Overholser (Surface Water)
Population Served: 644,000
Hardness: 200 PPM (11.7 grains per gallon)
Oklahoma City North's drinking water comes from surface sources — Lake Hefner + Lake Overholser. 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. Despite the treatment process, mineral hardness from the watershed carries through. The system serves 644,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request City of OKC Water'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 OKC Water in Oklahoma City North, OK, including ZIP codes:
73014, 73022, 73040, 73043, 73078, 73096, 73639, 73646, 73654, 73658, 73659, 73663, 73667, 73669, 73724, 73744, 73762, 73764, 73770, 73772, 73835, 73853, 73859
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Water Softener Sizing for Oklahoma City North
At 200 PPM (11.7 GPG), here is how to size a softener for your Oklahoma City North home. Multiply hardness in GPG (11.7) by daily water usage (roughly 50 gallons per person). A family of four uses about 200 gallons/day: 11.7 GPG × 200 gal = 2340 grains/day. Over a 7-day regeneration cycle, that is 16,380 grains - a 32,000-grain softener is the right fit for most Oklahoma City North households.
Compare Oklahoma City North to Other Oklahoma Cities
Frequently Asked Questions About Oklahoma City North Water
Is Oklahoma City North tap water safe to drink?
Where does Oklahoma City North's water come from?
Do I need a water softener in Oklahoma City North?
Does Oklahoma City North water damage tankless water heaters?
How much does hard water cost a Oklahoma City North household per year?
What is the hardness of Oklahoma City North water in grains per gallon?
What size water softener do I need for Oklahoma City North?
Salt-based softener or salt-free conditioner for Oklahoma City North?
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 Oklahoma City North Homeowners Actually Buy
Common purchases for homes with 200 PPM water.
Affiliate disclosure: we may earn a commission. Selection based on Oklahoma City North's water data.