Chromium-6 in Drinking Water: Health Risks, Sources, and How to Remove It
Chromium-6 is an inorganic chemical contaminant that can occur in drinking water supplies. The EPA has established a Maximum Contaminant Level (MCL) of 10 μg/L for this substance to manage its presence in tap water. Due to its potential health risks, monitoring and regulating its concentration is a key component of drinking water safety.
Health Effects
Exposure to Chromium-6 in drinking water is associated with serious health concerns. Consuming water containing this contaminant can lead to an increased risk of cancer, as well as damage to the liver and kidneys. These potential health impacts make it crucial to keep concentrations below the regulated limit.
How Chromium-6 Gets Into Tap Water
Chromium-6 can enter drinking water sources through both natural processes and human activities. It is found in natural underground deposits and can also be released into the environment via industrial discharge or the burning of coal. Once released, it can migrate into groundwater and affect local water systems.
How to Remove Chromium-6 From Your Water
There are several established water treatment technologies designed to remove Chromium-6 from drinking water. Methods such as ion exchange, reverse osmosis, and reduction/coagulation are effective at reducing its concentration. Treatment systems utilizing these methods are commonly certified for removing this specific inorganic contaminant.
Should You Test Your Water?
To determine if Chromium-6 is in your water, you can review your local water utility's consumer confidence report or utilize a WaterQ search for local water quality data. If you rely on a private well, scheduling periodic laboratory testing is recommended to ensure your water remains safe. You can also look up your local water system on WaterQ or check the Chromium-6 data page for reported levels in your area.
Frequently Asked Questions
Is Chromium-6 dangerous in drinking water?
Yes, exposure to Chromium-6 in drinking water carries significant health risks. It is associated with an increased cancer risk and can cause damage to the liver and kidneys. Because of these health concerns, its levels are regulated to protect public health.
How does Chromium-6 get into tap water?
Chromium-6 enters tap water from natural geological deposits in the earth, industrial discharge from manufacturing processes, and emissions from coal burning. These sources can contaminate both groundwater and surface water supplies.
How can I remove Chromium-6 from my water?
You can remove Chromium-6 from your water using treatment methods such as ion exchange, reverse osmosis, or reduction/coagulation. Certified residential water filtration systems employing these technologies are effective at reducing its levels.
Source: EPA National Primary Drinking Water Regulations and WaterQ National Database. For more contaminants, visit our contaminant library.
What actually removes chromium-6 (hexavalent chromium)
There is a real regulatory gap here: federal rules only limit total chromium at 100 ppb, which is far above the level health researchers flag for the hexavalent form. Reverse osmosis is the reliable home treatment. Some ion-exchange pitchers carry an NSF/ANSI 53 chromium claim and are a cheap partial measure, but check that the claim says chromium and not just lead.
Works
- Reverse osmosis (NSF 58)The broadest removal available at home: arsenic, nitrate, fluoride, PFAS, TDS.
- Ion-exchange pitcherDrives total dissolved solids near zero, but cartridges exhaust fast.
Will not fix this
- Basic activated carbon (NSF 42)
- Ion-exchange water softener
- UV disinfection (NSF 55)
- Boiling Makes it worse — evaporation concentrates what's left behind.
Test before you buy.Chromium-6 (hexavalent chromium) can't be seen, tasted or smelled, and the right hardware depends on the concentration you actually have. A certified lab test costs a fraction of the wrong filtration system. Start with your local water quality report, and get a mail-in lab test if you're on a private well.
Options that carry the right certification
Ordered cheapest-adequate first. Prices are indicative bands and move often.
| Product | Certification | Upfront | Per year | |
|---|---|---|---|---|
| APEC ROES-50 EssenceUnder-sink | Built with WQA-certified components to NSF/ANSI 58.Catch:Needs an under-sink drain connection and a spare hole for the dedicated faucet. Strips minerals — some people dislike the flat taste. | $180–240 | $50–80 | Check price |
| ZeroWater 5-Stage PitcherPitcher | NSF/ANSI 42 and 53 certified for lead and chromium; drives TDS toward zero.Catch:Cartridges exhaust quickly in high-TDS or hard water, which is exactly where people buy it — running cost is the highest of any pitcher. | $30–50 | $100–180 | Check price |
| AquaTru Countertop Reverse OsmosisCountertop | NSF/ANSI 42, 53, 58, 401 and P473 certified.Catch:Takes counter space and you refill a tank by hand. Wastes some water as brine, like all RO. | $400–500 | $80–130 | Check price |
Certification listings change. Before buying, confirm the current listing for the exact model in the NSF certified products database — a manufacturer's marketing page is not a certification. WaterQ earns a commission on purchases made through these links at no extra cost to you; see our affiliate disclosure. This is general information, not medical or engineering advice.
For a full breakdown of certifications, running costs and the models worth considering, see our buying guide for chromium-6 (hexavalent chromium).