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Delaware Hard Water
How Hard Is Delaware Water?
Delaware tap water is moderately hard to hard. The most recent City of Delaware water quality report shows hardness averaging 121 ppm, about 7.1 grains per gallon, with a range of 105 to 142 ppm. The city draws its water primarily from the Olentangy River, supplemented by deep groundwater wells on Penry Road, and treats it at the City of Delaware Water Treatment Plant.
Where Can I Get A Water Quality Report?
You can access Delaware’s annual Water Quality Report. This is also known as a consumer confidence report, and provides detailed data on the composition of your municipal water annually.
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FAQ
Additional Information On Delaware, OH Tap Water
Is Delaware tap water safe to drink?
Yes. Delaware’s drinking water meets federal and state standards for contaminants, and the city holds a current, unconditioned license to operate. The most recent water quality report notes one notification violation related to lead service line notices, which was resolved in January 2026.
Is Delaware tap water hard?
Yes. Delaware’s most recent water quality report shows hardness averaging 121 ppm, about 7.1 grains per gallon, with a range of 105 to 142 ppm. That falls in the moderately hard to hard range.
Is there PFAS in Delaware tap water?
Delaware’s most recent water quality report does not include PFAS results. Under the federal PFAS rule, utilities must begin compliance monitoring in 2027 and meet the new limits by 2029. Homeowners who want to know what’s in their water today can schedule a free water test with Culligan.
Does Delaware tap water have fluoride?
Yes. Delaware adds fluoride during treatment to help protect dental health. The most recent water quality report shows fluoride averaging 0.98 ppm, with a range of 0.84 to 1.21 ppm, well below the EPA maximum contaminant level of 4.0 ppm.
Where does Delaware get its tap water?
Delaware’s primary source is the Olentangy River, supplemented by deep groundwater wells on Penry Road about two miles north of the treatment plant. Ohio EPA rates the supply as highly susceptible to contamination from sources such as agricultural runoff and septic systems.
How is Delaware water treated?
The City of Delaware Water Treatment Plant uses advanced membrane treatment. River water is clarified and passed through ultrafiltration and nanofiltration membranes, while well water is filtered to remove iron and manganese before nanofiltration. Chlorine, fluoride, and a corrosion inhibitor are added before the water enters the distribution system.
Do I need a water softener or filter in Delaware?
Delaware’s water still measures moderately hard to hard at the tap, so many homeowners choose a water softener to reduce scale buildup on fixtures and appliances. Others add reverse osmosis or whole-house filtration to address chlorine taste and odor or for added peace of mind.
How does the City of Delaware monitor water quality?
The city tests for bacteria, lead, copper, nitrate, fluoride, disinfection byproducts, atrazine, turbidity, total organic carbon, and other substances. In its most recent lead and copper sampling, none of the 32 homes tested exceeded the lead action level, and the 90th percentile lead result was below detection.
Where can I get a local tap water quality report?
You can access the most recent City of Delaware Tap Water Quality Report here.
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Everyone at Culligan was great. The team was helpful, knowledgable, and followed up after the service was over.
Before using Culligan, everyone in our house always complained about our water issues. Culligan helped us eliminate our pain points and now we can confidently say we enjoy our water!
I had a great experience with Culligan. From beginning to end, they were there to answer all my questions and give me the water results I was hoping for.
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