In May 2026, more than 80 environmental and public health organizations sent a letter to the Department of Health and Human Services and the EPA calling nitrate contamination in drinking water a public health emergency. About a third of those groups are based in or focused on the Mississippi River basin, the region that supplies drinking water to the Midwest communities where a significant share of Bottleless Nation's customers operate.
The letter called on federal agencies to eliminate nitrate pollution sources and fund communities working to reduce levels to safe concentrations. More than a year into a renewed EPA review process, no new federal standard has been set.
Where Nitrates Come From in the Midwest
Agricultural fertilizer accounts for more than 70% of the nitrate load in Minnesota waters, with the rest coming from manure, septic systems, and lawn fertilizers. An estimated 158 million pounds of nitrate leave Minnesota per year via the Mississippi River. The same agricultural pattern runs through Wisconsin, Illinois, Indiana, and Iowa: corn, soy, and hog operations spread across the basin's drainage area.
When fertilizer nitrogen moves through soil into groundwater and surface water, it reaches municipal water systems and private wells alike. Utilities treat for bacteria and certain regulated contaminants, but standard treatment processes do not remove nitrates. Reverse osmosis does.
What the Data Shows for Midwest Businesses
An April 2026 analysis from the Environmental Working Group found that 18% of the U.S. population relies on community water systems with nitrate levels at or above 3 mg/L, the threshold the EPA identifies as an indicator of contamination. Minnesota water systems alone show detections across 760 of those systems. Wisconsin carries decades of accumulated agricultural runoff in its groundwater, with multiple counties showing elevated contamination in rural private wells where businesses and residents draw their supply.
The EPA's enforceable limit, the Maximum Contaminant Level, sits at 10 mg/L. Water tested below that number is compliant under federal law. Research links health effects to concentrations well below that limit, with long-term exposure in adults connected to elevated cancer risk. A 2026 study from the Iowa Environmental Council and the Harkin Institute at Drake University linked elevated nitrates in drinking water, combined with pesticides and PFAS, to rising cancer rates in Iowa counties where intensive agriculture dominates.
What the Health Risk Looks Like
At the MCL of 10 mg/L, the primary documented risk is methemoglobinemia in infants, a condition in which the body cannot carry enough oxygen through the bloodstream. The EPA set the 10 mg/L limit with infants under six months in mind.
The cancer research extends that concern to adults. Multiple peer-reviewed studies link chronic nitrate exposure below 10 mg/L to elevated colorectal, bladder, and ovarian cancer risk. The EPA restarted a formal health assessment of nitrates that could eventually lower the national standard, but no timeline has been set under the current administration.
For Midwest businesses, the relevant question is whether the water running through the building's lines carries a contaminant their employees consume every time they fill a cup.
What Point-of-Use Purification Removes
A bottleless water purification system with a reverse osmosis stage removes nitrates at the point of use before water reaches the dispenser. The RO membrane rejects dissolved ions, including nitrate, alongside PFAS compounds, lead, arsenic, and disinfection byproducts, the same contaminants documented in tap water supplies across the country. For a full breakdown of what tap water carries beyond nitrates, see the complete tap water guide for businesses. The purification happens on the incoming supply inside the building, so output quality holds regardless of the utility's source water or what the building's service line carries from the distribution system.
For businesses in Minneapolis, Minnesota; Milwaukee, Appleton, and Altoona, Wisconsin; Chicago, Illinois; Indianapolis, Indiana; and additional Bottleless Nation markets across the Midwest, on-site reverse osmosis addresses the nitrate gap that a compliant utility result does not close.
Bottleless Nation manages installation, scheduled purification system maintenance, and service calls under a single agreement.
Talk to our team about what's in your building's water.
Frequently Asked Questions
What is the EPA's maximum contaminant level for nitrates in drinking water?
The EPA's enforceable limit is 10 milligrams per liter (mg/L), also expressed as 10 parts per million. Water at or below that level is compliant under federal law. Research published in peer-reviewed journals has linked health effects, including elevated cancer risk, to chronic nitrate exposure at concentrations below the MCL. The EPA has been conducting a health assessment that could eventually lead to a revised standard, but no new limit has been announced.
Does a utility meeting the nitrate MCL mean there is no health risk?
Compliance means the system met the current legal standard during the monitoring period. The 10 mg/L limit was set primarily to address acute infant health effects from methemoglobinemia. Multiple peer-reviewed studies have linked chronic nitrate exposure in adults to elevated cancer risk at concentrations below the MCL. A compliant utility result is the legal baseline. Businesses evaluating what their workforce consumes have reason to look at the full research picture beyond that standard.
Does reverse osmosis remove nitrates from drinking water?
Reverse osmosis removes nitrates at the point of use by passing water through a semipermeable membrane that rejects dissolved ions. A well-maintained RO system removes a substantial portion of incoming nitrate content. For businesses on municipal supply in agricultural regions of the Midwest, point-of-use reverse osmosis addresses the nitrate load arriving through the service line regardless of what the utility's annual report shows.
Is nitrate contamination more of a concern in rural areas than in cities?
Rural communities drawing from groundwater wells tend to face higher nitrate concentrations because agricultural runoff reaches groundwater more directly. Municipal systems in urban centers draw from surface water or large aquifers that dilute contamination more. That said, urban businesses served by municipal systems in agricultural states still consume water that has traveled through nitrate-affected drainage basins, and their Consumer Confidence Report may show detections below the MCL that carry long-term exposure implications. An on-site RO purification system addresses the incoming nitrate content regardless of the source.
Which Midwest markets does Bottleless Nation serve?
Bottleless Nation serves businesses across Minneapolis, Minnesota; Milwaukee, Appleton, and Altoona, Wisconsin; Chicago, Illinois; Indianapolis and South Bend, Indiana; Columbus and Cincinnati, Ohio; and additional markets throughout the Mississippi River basin region.