Every year, Columbus Division of Water mails out its Consumer Confidence Report (CCR). Most homeowners toss it without reading it. That's understandable — it's dense, full of acronyms, and written for regulators, not families.

This article breaks down what the Columbus water quality report actually says, what the numbers mean for your home, and why "meets federal standards" is not the same as "nothing to worry about."

Columbus draws its drinking water from two surface water sources:

• Griggs Reservoir on the Scioto River
• O'Shaughnessy Reservoir, also on the Scioto River

Both are open reservoirs, which means they're exposed to runoff from agricultural land, urban stormwater, and the natural environment. The water is treated at the Dublin Road Water Plant and the Hap Cremean Water Plant before it reaches your tap.

Surface water is inherently more variable than groundwater. Seasonal changes, heavy rain events, and upstream land use all affect what enters the treatment system.

The CCR tests for contaminants regulated under the Safe Drinking Water Act. That list includes:

• Disinfection byproducts (trihalomethanes, haloacetic acids)
• Lead and copper (at the tap, not the treatment plant)
• Nitrates
• Microbial contaminants (bacteria, viruses)
• Regulated heavy metals (arsenic, barium, chromium)

What the report does not routinely test for:

• PFAS/PFOA (forever chemicals) — though Ohio EPA has begun some monitoring
• Pharmaceuticals and personal care products
• Microplastics
• Emerging contaminants not yet regulated under federal law
• Contaminants introduced by your home's plumbing after the water leaves the main

That last point is critical. The CCR measures water quality at the treatment plant and at a sample of taps across the distribution system. It does not measure what comes out of your specific faucet.

Columbus uses chlorine and chloramine to disinfect water. These disinfectants are necessary — they kill pathogens. But they react with naturally occurring organic matter in the water to form disinfection byproducts (DBPs).

The two main categories are:

• Total Trihalomethanes (TTHMs) — EPA limit: 80 parts per billion (ppb)
• Haloacetic Acids (HAA5s) — EPA limit: 60 ppb

Columbus typically reports annual averages well below these limits. But "below the limit" doesn't mean zero. Long-term exposure to DBPs at any level is an active area of research, and some studies have associated elevated DBP exposure with increased cancer risk over decades.

A quality carbon filter — either a whole-house system or an under-sink unit — removes the vast majority of DBPs from your drinking water.

Columbus has older housing stock. Homes built before 1986 may have lead solder in their plumbing. Homes built before 1950 may have lead service lines connecting the street main to the house.

The CCR reports lead at the 90th percentile of tested taps. If that number is below 15 ppb, Columbus is in compliance. But the EPA's own science advisors have stated there is no safe level of lead exposure for children.

If your home was built before 1986, lead testing at your specific tap is worth doing. A reverse osmosis system or a certified lead-reduction filter at the point of use is the most reliable protection.

Nitrates enter the water supply primarily from agricultural runoff — fertilizers and animal waste. The EPA limit is 10 milligrams per liter (mg/L).

Columbus surface water sources are downstream of agricultural land. Nitrate levels in the Scioto watershed tend to spike in spring and early summer after fertilizer application. The treatment plant monitors and responds to these spikes, but nitrate is not removed by standard carbon filtration. Reverse osmosis is the most effective residential treatment.

Nitrates are particularly dangerous for infants under six months old.

Federal drinking water standards (Maximum Contaminant Levels, or MCLs) are set through a regulatory process that balances public health protection with the cost of treatment at a municipal scale. They are not set at zero-risk levels — they're set at levels where the risk is considered acceptable given the cost of removal.

In plain terms: meeting the standard means the water is legal to distribute. It does not mean the water is optimal for your family's health, especially for:

• Infants and young children
• Pregnant women
• People with compromised immune systems
• Anyone with older plumbing in their home

The CCR cannot account for what happens to water after it enters your home. Older copper pipes with lead solder, galvanized steel pipes that leach rust and sediment, and even new brass fixtures can introduce contaminants that weren't present when the water left the treatment plant.

This is why point-of-use and point-of-entry filtration matters even in cities with well-run water utilities.

If you're on a private well in the Columbus metro area — in Licking, Delaware, Fairfield, Pickaway, or the rural parts of Franklin County — none of this applies to you. The CCR only covers municipal water customers.

Well water is not regulated by the EPA or Columbus Division of Water. You are responsible for testing and treating your own water. Common issues in central Ohio well water include:

• Iron — very common in the glacial till soils of central Ohio
• Hardness — high calcium and magnesium content
• Bacteria — especially coliform, after heavy rain events
• Nitrates — from agricultural runoff and septic systems
• Hydrogen sulfide — the "rotten egg" smell

We recommend annual testing for well water users. A comprehensive water test runs $100–$200 and gives you a complete picture of what you're dealing with.

You don't have to accept whatever comes out of your tap. Practical options include:

For city water users:

• A whole-house carbon filter removes chlorine, chloramines, and DBPs from every tap in the house
• An under-sink reverse osmosis system removes nitrates, lead, DBPs, and most other dissolved contaminants from your drinking and cooking water
• A water softener addresses hardness, which is typically 200–300 mg/L in Columbus city water

For well water users:

• Start with a comprehensive water test — don't guess
• Iron filters (like our Iron Breaker system with Katalox Light media) address iron and manganese
• UV sterilization handles bacteria
• A whole-house softener handles hardness
• An RO system at the kitchen sink handles nitrates and other dissolved contaminants

Columbus water is treated, monitored, and generally safe by federal standards. But "safe" is a floor, not a ceiling. If you want water that's genuinely clean — free of disinfection byproducts, protected against lead from your own plumbing, and optimized for drinking and cooking — a home filtration system is the most reliable path.

We test Columbus-area water and install filtration systems across Central Ohio. If you want to know what's actually in your water, we offer free water testing throughout Columbus & Central Ohio. Call us at (614) 476-8711 or schedule a free water test online.

• Columbus Ohio Water Contaminants 2026: What's In Your Tap Water?
• PFAS and Forever Chemicals in Ohio Drinking Water
• Is Columbus Tap Water Ruining Your Hair and Skin? The Chlorine Problem
• Hard Water in Columbus Ohio: Signs, Costs & How to Fix It
• Alkaline Reverse Osmosis Drinking Water Systems
• Whole House Water Filters for Columbus, Ohio
• Water Softeners for Columbus, Ohio
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• Water Softeners for Reynoldsburg, Ohio
• Schedule a Free Water Test