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Water Quality?

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Sen. Young sent us an email which contained a link to recent Indy Starr story. The story being told about improving water quality in Indianapolis and along the Ohio River deserves a closer look. Headlines celebrating progress often focus on isolated improvements or large infrastructure investments while ignoring the broader and more complicated reality of water pollution in Indiana’s largest city and across the state. For readers trying to understand the truth, the situation is neither a simple success story nor a hopeless disaster—it is a long-running struggle between infrastructure upgrades, regulatory pressure, and persistent pollution sources that remain difficult to control.

Indianapolis sits on the White River watershed, which drains much of central Indiana before eventually reaching the Wabash and then the Ohio River. For more than a century, the region’s water quality problems have been tied to the rapid urbanization of Indianapolis and surrounding counties. Historically, wastewater systems in Indianapolis were built as “combined sewer systems,” meaning that stormwater and raw sewage were carried through the same pipes. During heavy rain events the system frequently overflowed, sending untreated sewage directly into rivers and streams. These overflow events were so common that they became a defining environmental issue for the city. (Wikipedia)

Federal regulators forced Indianapolis to address the problem nearly two decades ago. In 2006 the city agreed to a sweeping federal settlement requiring roughly $1.86 billion in sewer improvements after the U.S. Department of Justice and the EPA found repeated violations of the Clean Water Act caused by sewer overflows into local waterways. (Department of Justice) That settlement triggered the DigIndy tunnel project—one of the largest municipal water infrastructure projects in the Midwest. The system, completed in 2025, consists of deep underground tunnels capable of storing roughly 250 million gallons of combined sewage during storms so it can be treated later rather than released into rivers. (Wikipedia)

Supporters of recent news coverage argue that projects like DigIndy represent a major environmental success. They point out that modern wastewater treatment plants and deep-storage tunnels significantly reduce the number of sewage overflow events entering the White River and its tributaries. From an engineering standpoint that claim is not wrong. Compared with the mid-twentieth century—when the White River was widely described as heavily polluted by industrial waste and untreated sewage—conditions today are objectively better. (Discover White River)

But describing the situation as a dramatic improvement can be misleading if readers assume the underlying water quality problems have largely been solved. In fact, multiple environmental assessments show that large sections of the White River watershed still fail to meet water quality standards. More than three-quarters of the river in Marion County has historically not met state water quality benchmarks, largely because of bacteria contamination and runoff. (Indianapolis Recorder) Even the first comprehensive “report card” for the river gave it a middle-of-the-road grade—about a C—indicating moderate health with substantial room for improvement. (WRTV Indianapolis)

The reason is that sewer overflows are only one part of the problem. Modern water pollution increasingly comes from what environmental regulators call “non-point sources,” meaning pollution that does not come from a single identifiable pipe or factory. In Indiana these sources are often tied to agricultural runoff, livestock manure, fertilizer, and urban stormwater carrying oil, chemicals, and bacteria into streams. A national analysis found that Indiana has more miles of rivers and streams classified as too polluted for swimming than any other state, a statistic often linked to runoff from large animal feeding operations and agricultural practices. (WFYI Public Media)

Urban development compounds the issue. When forests and wetlands are replaced with pavement and buildings, rainwater no longer filters through soil before entering waterways. Instead, it rushes into storm drains carrying pollutants from streets, lawns, and construction sites. Historic wetland loss in Indiana—where only a small fraction of original wetlands remain—has removed one of the natural systems that once filtered water before it reached rivers. (WRTV Indianapolis)

There are also structural realities that make Midwestern river cleanup difficult. The White River basin drains farmland, industrial areas, suburbs, and the Indianapolis metro region itself. Pollutants entering upstream tributaries eventually move through the city and downstream toward the Ohio River. Even if Indianapolis were to eliminate every sewer overflow tomorrow, runoff from agriculture and surrounding counties would still influence water quality.

This broader context is rarely emphasized in simple headlines declaring water quality “improvements.” Infrastructure projects like DigIndy do address a specific category of pollution—combined sewer overflows—but they cannot solve agricultural runoff, industrial legacy pollution, or watershed-wide land use practices. In other words, the system can prevent raw sewage from spilling into rivers during storms, yet bacteria and nutrient pollution from other sources may continue to degrade water quality.

Another reason readers should approach overly optimistic narratives with caution is the difference between regulatory compliance and ecological health. Cities often celebrate when infrastructure projects meet federal consent decree requirements, but compliance does not automatically mean a river is clean enough for swimming or drinking without heavy treatment. Regulators themselves acknowledge that many waterways across the United States remain “impaired,” meaning they do not meet the Clean Water Act’s original goal of making rivers fully fishable and swimmable. (WFYI Public Media)

The story of Indianapolis water quality, therefore, is one of partial progress rather than complete success. The city has invested billions of dollars in infrastructure to correct mistakes built into nineteenth-century sewer systems. Those investments are real and measurable. But the broader environmental picture—especially when considering agriculture, watershed runoff, and bacterial contamination—shows that the White River and related waterways remain under significant pressure.

For Hoosiers, the real takeaway should not be that the water crisis is solved or that improvement claims are entirely false. Instead, the truth lies somewhere in between. The engineering battle against sewage overflows is being won, but the ecological battle for clean rivers across Indiana is far from finished. The challenge now is less about digging tunnels under Indianapolis and more about changing how an entire watershed—urban and rural alike—manages land, waste, and water.