About 15% of Central Ohio households get their water from private wells rather than the Columbus city water system. If you're buying a home in Delaware County, Licking County, Union County, or the rural fringes of Franklin County, there's a real chance you'll be on well water.

Both sources have advantages and disadvantages — and both require treatment for most Central Ohio homes. Here's a complete comparison.

Columbus draws water from the Griggs Reservoir and O'Shaughnessy Reservoir, both fed by the Scioto River. The Columbus Division of Water treats this water through:

1. Coagulation and flocculation (removing suspended particles)
2. Sedimentation (settling out particles)
3. Filtration (removing remaining particles)
4. Disinfection with chloramines
5. pH adjustment and corrosion control (orthophosphate to reduce lead leaching)
6. Fluoride addition

The treated water travels through a distribution system of pipes to your home. The city tests the water continuously and publishes an annual Consumer Confidence Report.

A private well draws groundwater from an aquifer — a layer of permeable rock, sediment, or soil that holds water. In Central Ohio, most wells tap into:

• Glacial aquifers — sand and gravel deposits left by glaciers, common in Delaware, Union, and Licking counties
• Bedrock aquifers — fractured limestone or sandstone, common in more rural areas

Well water is not treated before it reaches your tap. You are responsible for testing, treating, and maintaining your water supply. There is no regulatory oversight of private well water quality.

City water: Continuously monitored and regulated by the EPA under the Safe Drinking Water Act. The Columbus Division of Water tests for hundreds of contaminants and must meet strict MCLs. Annual CCR published publicly.

Well water: Unregulated. You are responsible for testing. The Ohio EPA recommends annual testing for bacteria and nitrates, and comprehensive testing every 3–5 years. Many well owners test far less frequently — or never.

City water: Monthly utility bill. Columbus residential water rates average $30–$60/month for a typical household, plus sewer charges.

Well water: No monthly water bill. However, you pay for electricity to run the pump, annual testing ($50–$300), and any treatment equipment and maintenance. Well pump replacement runs $800–$2,500. Over a 20-year period, total costs are often comparable.

City water: Consistent taste year-round. Chloramine taste/odor is the most common complaint. Hard at 150 mg/L.

Well water: Taste varies significantly by location. Central Ohio well water is often harder than city water (200–400 mg/L is common), and may have elevated iron, manganese, hydrogen sulfide (rotten egg smell), or other minerals depending on the local geology.

City water: Highly reliable. Outages are rare and typically brief. Pressure is consistent.

Well water: Dependent on your pump and power supply. Power outages mean no water unless you have a generator or hand pump. Drought can lower water tables and reduce well yield. Pump failures require emergency repair.

City water: Draws from surface water (reservoirs), which is renewable but subject to drought and contamination from runoff.

Well water: Draws from groundwater, which recharges slowly. Heavy pumping can lower the water table. Agricultural runoff, septic systems, and industrial activity can contaminate aquifers.

Well water in Central Ohio almost always requires treatment. The specific treatment depends on what's in your water — which is why testing is essential before choosing equipment.

Minimum recommended:

• Water softener (hardness is the primary issue for most homes)

Comprehensive protection:

• Water softener + whole-house catalytic carbon filter (removes chloramines)
• Under-sink reverse osmosis (removes PFAS, lead, and everything else for drinking water)

Minimum recommended:

• Annual bacteria and nitrate testing
• Water softener (hardness is almost always present)

Typical well water treatment system:

1. Sediment pre-filter — removes particles that can foul downstream equipment
2. Iron filter (if iron > 0.3 mg/L) — removes iron and manganese before the softener
3. Water softener — removes hardness
4. UV sterilization — kills bacteria, viruses, and other pathogens
5. Under-sink RO — removes nitrates, arsenic, and other contaminants for drinking water

The specific combination depends on your test results. Some wells need all five; others need only a softener and UV system.

If you're purchasing a home with a well, the home inspection should include a water quality test. At minimum, test for:

• Bacteria (total coliform and E. coli) — required by most mortgage lenders
• Nitrates — especially if near agricultural land or septic systems
• Hardness — almost certainly present; determines softener sizing
• Iron and manganese — common in Central Ohio
• pH — affects corrosivity and treatment needs

For comprehensive protection, also test for:

• Arsenic
• Lead
• Volatile organic compounds (VOCs)
• PFAS (if near industrial sites or military bases)

Pure Aqua Columbus can perform an in-home water test and refer you to a certified lab for parameters that require laboratory analysis.

Is well water safe to drink in Central Ohio? It depends entirely on what's in your specific well. Central Ohio well water often contains elevated hardness, iron, and sometimes bacteria or nitrates. Annual testing and appropriate treatment make well water safe. Untested, untreated well water carries real health risks.

Is Columbus city water better than well water? "Better" depends on your priorities. City water is consistently treated and regulated. Well water has no monthly bill and no chloramines. Both require treatment for most Central Ohio homes — just different treatment.

How do I know if my well water has bacteria? You need a laboratory test. Bacteria are colorless, odorless, and tasteless — you cannot detect them without testing. The Ohio EPA recommends annual testing for total coliform bacteria.

Can I connect to Columbus city water if I'm on a well? Possibly, depending on your location. Columbus and suburban utilities have been expanding service areas. Contact your local water utility to find out if connection is available and what the cost would be.

How often should I test my well water? The Ohio EPA recommends testing for bacteria and nitrates annually, and a comprehensive panel every 3–5 years. Test more frequently if you notice changes in taste, odor, or color, or after flooding or nearby construction.

What's the most common well water problem in Central Ohio? Hardness and iron. Central Ohio's limestone geology produces very hard water, and iron is common in glacial aquifer areas. Most well water treatment systems in this region start with an iron filter followed by a water softener.

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