Both Iowa and Nebraska face severe agricultural water contamination – nitrates from fertilizer and livestock, atrazine from corn farming, and bacterial runoff from concentrated animal operations. Iowa has more documented water quality violations and higher nitrate levels in surface water. Nebraska relies more heavily on groundwater from the Ogallala Aquifer, which provides a buffer but is increasingly threatened. Neither state has set PFAS limits beyond federal standards.
Iowa and Nebraska are defined by agriculture – corn, soybeans, and livestock dominate both economies and both water quality profiles. The contaminants these states fight aren't PFAS or lead (though both exist); they're nitrates from fertilizer, atrazine from herbicides, and bacteria from animal waste. These are states where farming practices matter more to your water quality than factory locations.
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Iowa's Department of Natural Resources manages roughly 1,900 public water systems serving 2.4 million residents. Nebraska's Department of Environment and Energy oversees about 1,300 systems for 1.5 million. Both states have extremely high agricultural land use – over 85% of Iowa and 90% of Nebraska's land is farmland. This intensity drives the water quality challenges both states face.
Check your water quality by zip code for your system's data.
PFAS detection rates in both states are below the national average – fewer military bases and less PFAS-using industry translate to fewer contamination sources. The real water quality battle in both states is nitrate. Des Moines Water Works made national news in 2015 when it activated the world's largest nitrate removal system to keep drinking water within federal limits. According to Iowa DNR data from 2025, the Raccoon River – Des Moines' primary source – regularly exceeds the 10 mg/L nitrate MCL during spring runoff, requiring continuous treatment.
Nebraska's nitrate challenge is in groundwater. The Ogallala Aquifer, which provides drinking water to much of the state, has shown rising nitrate trends over decades. A 2024 University of Nebraska study found that 20% of tested domestic wells in the Central Platte region exceeded the EPA nitrate limit, up from 12% in 2010.
Iowa draws heavily from surface water – rivers and reservoirs that collect agricultural runoff across the state's intensively farmed landscape. This means treatment plants must handle high seasonal loads of nitrates, atrazine, and turbidity, especially during spring planting and fall harvest when runoff peaks.
Nebraska relies more on groundwater, primarily from the Ogallala Aquifer. Groundwater is naturally filtered and arrives cleaner than surface water, but once contaminated with nitrates, aquifers take decades to recover. The Ogallala is both Nebraska's greatest water quality asset and its long-term vulnerability – current farming practices are slowly degrading an aquifer that took millions of years to fill.
Both states have concentrated animal feeding operations (CAFOs) that generate massive amounts of waste. Iowa has over 10,000 registered CAFOs, according to Iowa DNR data – more than any other state. The manure from these operations, when applied to fields, adds to nitrate and bacterial contamination of water sources.
Neither state has set water quality standards beyond federal limits for PFAS or any other emerging contaminant. Both states face intense agricultural industry lobbying that limits regulatory action on farm runoff. Iowa's nutrient reduction strategy – a voluntary framework for reducing nitrogen and phosphorus runoff – has not met its targets since adoption in 2013.
Nebraska has a slightly better groundwater monitoring program, driven by the Nebraska Department of Environment and Energy's long-running nitrate monitoring network. But monitoring isn't regulation – the state documents the problem without mandating the farming practice changes that would fix it.
Nebraska has a slight edge because groundwater starts cleaner than Iowa's surface water sources. Urban systems in Omaha and Lincoln generally meet all standards without the intensive treatment that Des Moines requires. Iowa's surface water dependence means more treatment is needed to achieve the same result.
For private well users, the situation is reversed in some areas – Nebraska's rising Ogallala nitrate levels create a slow-motion crisis for rural residents. Iowa's private wells face similar agricultural contamination risks.
The verdict: Nebraska's groundwater advantage gives it a slight overall edge. Both states urgently need agricultural reform to protect water quality long-term, and neither is on track to achieve it.
Check your water quality by zip code for your system's EPA data. Private well users in both states should test annually for nitrates, especially during spring runoff season.
For nitrate removal, reverse osmosis is required – carbon filters like the Brita don't remove nitrates. The AquaTru reverse osmosis system handles nitrates, atrazine, and PFAS. For lead and chlorine only, the Brita Elite works. See our water filter guide.
Detailed analysis: get a water quality PDF report. State pages: Iowa and Nebraska.
Is Iowa or Nebraska water safer? Nebraska has a slight edge due to groundwater sources that start cleaner than Iowa's agricultural surface water. Iowa's Des Moines system requires the world's largest nitrate removal facility to meet standards. Both states face severe agricultural contamination and neither has set PFAS limits beyond federal standards.
Why is nitrate so high in Iowa water? Iowa's intensive corn and soybean farming uses large amounts of nitrogen fertilizer, and the state has over 10,000 concentrated animal feeding operations producing manure. Rain washes nitrates from fields into rivers and reservoirs that supply drinking water, especially during spring runoff.
Is the Ogallala Aquifer contaminated? Parts of the Ogallala Aquifer in Nebraska show rising nitrate levels from agricultural activity. A 2024 University of Nebraska study found 20% of tested domestic wells in the Central Platte region exceeded the EPA nitrate limit, up from 12% in 2010. The trend is worsening.
Does a Brita filter remove nitrates? No. Standard carbon filters including the Brita Elite do not remove nitrates from water. Reverse osmosis is required for nitrate removal. Iowa and Nebraska residents with nitrate concerns need an RO system like the AquaTru.
What is atrazine and is it in Iowa water? Atrazine is a widely used herbicide in corn farming. It's frequently detected in Iowa surface water during planting season. The EPA MCL for atrazine is 3 ppb. While most treated drinking water meets this limit, raw surface water levels can spike much higher during spring runoff.