Oklahoma has 4 tracked water utilities serving approximately 1.3M residents. The average water hardness is 222 ppm (13 GPG), classified as Very Hard — above the national average of 100 ppm. Hardness ranges from 145 ppm in Broken Arrow Municipal Authority to 300 ppm in Norman.

No cities in Oklahoma have recorded water quality violations in the past 3 years — an excellent compliance record. All 4 tested cities have lead levels below the EPA action level of 15 ppb.

With very hard water on average, many Oklahoma residents may notice mineral buildup on fixtures, dry skin, or stiff-feeling hair. A shower filter for hard water can help reduce chlorine exposure, while a water softener addresses the mineral buildup directly.

Frequently Asked Questions About Oklahoma Water

Is tap water safe to drink in Oklahoma?

Based on available EPA data, no cities in Oklahoma have recorded water quality violations in the past 3 years. However, water quality can vary by building — older homes may have lead pipes. Consider testing your water at home for complete peace of mind.

How hard is the water in Oklahoma?

Oklahoma's average water hardness is 222 ppm (13 GPG), classified as Very Hard. This is above the national average of 100 ppm. Hardness varies significantly by city — use our Water Hardness Calculator to check your specific area.

Which city in Oklahoma has the cleanest tap water?

Based on EPA violation data, lead testing, and water quality metrics, Oklahoma City ranks as having the cleanest tap water in Oklahoma. It has zero violations in the past 3 years and lead levels well below the EPA action level.

Where does Oklahoma get its water from?

The majority of Oklahoma's water systems (100%) use surface water as their primary source. Surface water comes from rivers, lakes, and reservoirs. Each city's specific source can vary — check individual city reports for details.