Columbus Water Quality at a Glance
significant concerns
Is Columbus Water Safe to Drink?
Generally Yes, With Caution — Columbus water meets all federal standards and is regularly tested, but the city faces significant disinfection byproduct contamination, with total trihalomethanes at levels 277 times above EWG health guidelines. Additional concerns include chromium-6 and haloacetic acids. PFAS detected are low-level compounds not subject to EPA’s new drinking water MCLs — PFOA and PFOS were not detected. A certified water filter is strongly recommended for Columbus households.
⚠️ Key Concerns for Columbus Residents
- Disinfection Byproducts: Total trihalomethanes at 41.6 ppb (277x above EWG health guidelines, though below EPA legal limit of 80 ppb)
- Haloacetic Acids: HAA5 at 19.7 ppb and HAA9 at 21.8 ppb — significantly above independent health benchmarks
- Chromium-6: Hexavalent chromium detected at 0.207 ppb — approximately 10x above EWG health guidelines, though no federal MCL exists
- PFAS — 2026 Update: UCMR 5 testing is now ~95% complete nationally. Columbus detected only short-chain PFAS (PFBA, PFHxA, PFPeA) at very low levels. Critically, PFOA and PFOS — the most strictly regulated compounds — were not detected
Read the full report below for detailed analysis, city-specific data, and actionable recommendations for Columbus residents.
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Columbus – Ohio – Water Quality Report 2026: PFAS Testing, Infrastructure Concerns & Safety across your city
Columbus, Ohio’s largest city and the 14th-largest in the United States, delivers water to over 1.5 million residents through the Columbus Division of Water — one of the Midwest’s most extensive municipal water systems. The division manages approximately 5,000 miles of water mains, three major water treatment plants (Parsons Avenue, Hap Cremean, and Dublin Road), and numerous pumping stations, delivering around 130 million gallons daily across the city and surrounding communities.
Columbus draws its water supply primarily from the Scioto River and Big Walnut Creek, with additional supply from Griggs, O’Shaughnessy, and Hoover reservoirs, plus supplementary groundwater from Ranney Collector Wells. The city has invested heavily in watershed protection and advanced treatment technologies. Columbus is recognised for its proactive approach to water infrastructure management — including extensive lead service line replacement programmes and green infrastructure initiatives. Check our live boil water tracker for any current alerts affecting Columbus or surrounding Ohio communities.
Columbus Water Quality: Current Status (2025–2026)
Latest Testing Results
- Federal Compliance: Columbus water meets all federal and state drinking water standards, maintaining full compliance with EPA and Ohio EPA requirements. The city produces an annual Consumer Confidence Report (CCR) covering all regulated contaminants.
- Disinfection Byproducts: Total trihalomethanes (TTHMs) detected at 41.6 ppb — 277 times above EWG health guidelines but below the EPA legal limit of 80 ppb. Haloacetic acids (HAA5) at 19.7 ppb, 197 times above EWG guidelines but below the EPA limit of 60 ppb.
- Testing Scope: Columbus conducts extensive water quality testing across its distribution network, monitoring over 100 different contaminants and reporting all results in annual CCRs.
PFAS — 2026 Update
- UCMR 5 Testing Complete: Columbus participated in the EPA’s fifth Unregulated Contaminant Monitoring Rule (UCMR 5), testing for 29 PFAS compounds. Nationally, UCMR 5 data is now approximately 95% complete as of January 2026, with a final data release expected in autumn 2026.
- PFAS Detections Remain Low: Columbus has detected short-chain PFAS compounds including PFBA (3.70 ppt), PFHxA (1.72 ppt), and PFPeA (1.28 ppt) at very low levels. Critically, PFOA and PFOS — the two most strictly regulated compounds under EPA’s April 2024 rule — were not detected in Columbus water.
- EPA Regulatory Update (2025–2026): The EPA has proposed rescinding the MCLs for PFHxS, PFNA, PFBS, and GenX (HFPO-DA), retaining enforceable limits only for PFOA and PFOS at 4 parts per trillion. The compliance deadline for PFOA and PFOS has been extended from 2029 to 2031. As of January 2026, a federal court denied the EPA’s proposal to vacate the existing limits, preserving the status quo pending further litigation.
- Chromium-6 Levels: Hexavalent chromium detected at 0.207 ppb — approximately 10 times above EWG health guidelines. No federal MCL exists for chromium-6, making it an unregulated but monitored concern.
State-of-the-Art Treatment
- Advanced Treatment Facilities: Three major treatment plants — Parsons Avenue, Hap Cremean, and Dublin Road — use comprehensive processes including coagulation, sedimentation, filtration, and chlorine disinfection.
- Disinfection Management: Chlorine disinfection levels are carefully optimised to eliminate harmful pathogens while minimising the formation of trihalomethanes and haloacetic acids, though these byproducts remain a concern. See our guide to water filter solutions for options that address DBPs.
- Source Water Protection: Extensive watershed management along the Scioto River and Big Walnut Creek, including agricultural best-practice programmes and industrial pre-treatment requirements.
Infrastructure Excellence
- Smart Water Technology: Advanced metering infrastructure with leak detection, real-time water quality monitoring, and SCADA systems for optimal management across the distribution network.
- Main Replacement Strategy: Systematic replacement of ageing water mains, with approximately 50 miles renewed annually in coordination with street improvement projects.
- Green Infrastructure: Columbus is implementing over 100 green infrastructure projects — including bioswales, permeable pavements, and rain gardens — to reduce stormwater impacts on source water quality.
Environmental Leadership
Columbus maintains transparency in water quality reporting and has been proactive in testing for emerging contaminants like PFAS. The city’s integrated watershed management combines traditional infrastructure improvements with nature-based solutions. Full water quality reports are published annually and available at columbus.gov. For broader context on water quality across the state, see our Ohio water quality guide.
Recommendations for Columbus Residents
Consider Water Filtration
Given elevated disinfection byproducts and chromium-6, consider NSF-certified activated carbon or reverse osmosis filters. These can reduce trihalomethanes, haloacetic acids, chromium-6, and other treatment byproducts. Contact Columbus Water Quality Lab at (614) 645-7691 for guidance on the best option for your household.
Monitor Water Quality Reports
Stay informed through Columbus’s annual Consumer Confidence Report and quarterly updates at columbus.gov. You can also monitor our water alert news page for the latest drinking water developments affecting Ohio communities.
Request Water Testing
Contact Columbus Division of Water at (614) 645-7878 for information about water testing options. Testing is especially worthwhile for households with pregnant women, infants, or young children — the populations most vulnerable to lead, chromium-6, and disinfection byproducts.
Reduce Chlorine Taste
If you notice chlorine taste or odour, fill a pitcher and refrigerate for several hours to allow it to dissipate naturally. This is normal and safe, but can be reduced through simple storage or a basic carbon filter. Visit our water quality resources page for more practical tips.
Conserve Resources
Participate in Columbus’s water conservation programmes, including rebates for efficient fixtures and rain barrel sales. Report leaks promptly to (614) 645-8277 to help maintain system efficiency and protect shared water resources across Ohio.
Quality News About Your Water
Get the comprehensive water quality news coverage you need with our dedicated US Water News Service. From coast to coast, we deliver in-depth reporting and expert analysis on PFAS contamination, EPA regulatory changes, infrastructure developments, and emerging water safety issues affecting communities nationwide. While mainstream media only covers the biggest stories, we provide the detailed, ongoing coverage that helps you understand the full scope of America’s water challenges.
What’s actually in your tap water? Enter your ZIP code for a full breakdown of contaminants detected in your local supply
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Frequently Asked Questions
Are the disinfection byproducts in Columbus water dangerous?
Columbus water meets all federal safety standards for disinfection byproducts. However, levels of trihalomethanes and haloacetic acids are significantly higher than independent health benchmarks suggest is optimal for long-term safety:
• Current levels: Total trihalomethanes at 41.6 ppb, haloacetic acids at 19.7 ppb
• Federal limits: 80 ppb for trihalomethanes, 60 ppb for haloacetic acids
• EWG health guidelines: Recommend much lower levels — as little as 0.15 ppb for total trihalomethanes
These byproducts form when chlorine disinfectant reacts with naturally occurring organic matter in source water. Long-term exposure to elevated levels may increase bladder cancer risk and cause liver, kidney, and reproductive effects — which is why many Columbus residents choose point-of-use activated carbon or reverse osmosis filtration.
What did UCMR 5 PFAS testing find in Columbus?
Columbus participated in the EPA’s fifth Unregulated Contaminant Monitoring Rule (UCMR 5), testing for 29 PFAS compounds. The key findings as of 2026:
• PFBA: 3.70 parts per trillion (ppt)
• PFHxA: 1.72 ppt
• PFPeA: 1.28 ppt
• PFOA and PFOS: Not detected
These detected compounds are short-chain PFAS not currently subject to EPA Maximum Contaminant Levels. The most important finding is that PFOA and PFOS — the two most strictly regulated “forever chemicals” under EPA’s April 2024 rule — were absent from Columbus water. UCMR 5 data nationally is approximately 95% complete and the final release is expected in autumn 2026. Columbus compares favourably to other Ohio cities with industrial or military PFAS sources nearby.
What type of water filter should Columbus residents consider?
Based on Columbus water quality data, residents should consider filters that address the main contaminants of concern:
For Disinfection Byproducts (Primary Concern):
• Activated carbon filters (pitcher, faucet-mount, or under-sink) certified to NSF/ANSI Standard 53
• Highly effective at reducing TTHMs and haloacetic acids
For Comprehensive Protection:
• Reverse osmosis systems remove the widest range of contaminants including chromium-6, DBPs, and most PFAS compounds
• Higher upfront cost but most effective long-term solution
For Chromium-6:
• Reverse osmosis or ion exchange systems certified to NSF/ANSI 58
• Activated carbon alone is not sufficient for chromium-6 removal
Contact Columbus Water Quality Lab at (614) 645-7691 for specific recommendations based on your location and household needs.
Why does my Columbus water smell like chlorine sometimes?
Columbus uses chlorine as its primary disinfectant to ensure safe water throughout the distribution system. A stronger chlorine smell or taste is more noticeable:
• During warmer months when higher disinfectant levels are maintained to prevent bacterial growth
• After water main breaks or system maintenance when additional chlorine is added
• If you live closer to a water treatment plant
• During periods of high water demand
This is normal and does not affect regulatory safety. However, the chlorination process that produces this odour is also responsible for Columbus’s elevated disinfection byproducts. To reduce chlorine taste or odour:
• Fill a pitcher and refrigerate for several hours
• Let water sit uncovered at room temperature before drinking
• Use a basic activated carbon filter — the most practical and affordable solution
Contaminants of Concern
Disinfection Byproducts
Source: Form when chlorine used for disinfection reacts with naturally occurring organic matter in the Scioto River and Big Walnut Creek source water
Health Effects: Long-term exposure to elevated levels may increase risk of bladder cancer, liver problems, and reproductive effects — even at concentrations that meet legal limits
Current Levels: Total trihalomethanes at 41.6 ppb (277x above EWG guidelines); haloacetic acids at 19.7 ppb (197x above EWG guidelines)
EPA Limits: 80 ppb for trihalomethanes; 60 ppb for haloacetic acids — Columbus meets both, but independent health benchmarks are far lower. An NSF-certified carbon filter is the most practical household solution.
Chromium-6 & PFAS — 2026 Update
Chromium-6 Source: Likely from industrial activity and natural geological deposits in the region; no federal MCL currently applies
Chromium-6 Level: 0.207 ppb — approximately 10x above EWG’s health guideline. Reverse osmosis or ion exchange filters are the most effective household treatment
PFAS Status (UCMR 5): Short-chain PFAS detected at 1.28–3.70 ppt. PFOA and PFOS — the compounds with the strictest EPA MCLs — were not detected in Columbus water
EPA Regulatory Shift: The EPA is now retaining MCLs only for PFOA and PFOS (4 ppt each), and has proposed rescinding limits for four other PFAS. Compliance deadline extended to 2031. Columbus currently meets all applicable standards. See our water alert news for the latest regulatory updates.
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