Short answer: yes, pressure washing your own driveway is legal in Indianapolis, and no permit is required for a homeowner cleaning their own property. The part people don't realize is regulated is what happens to the water afterward — and that part genuinely matters.
The Actual Rule: It's About the Runoff, Not the Washing
Under Indianapolis-Marion County's stormwater regulations, the only things legally allowed to enter a storm drain are rainwater, snowmelt, lawn irrigation runoff, and groundwater from sump pumps. Anything else — including wash water carrying detergent, oil, dirt, or other residue — is classified as an illicit discharge if it flows into a storm drain, ditch, or directly into a creek or waterway.
Why This Distinction Exists
Storm drains in Indianapolis flow directly to local waterways without treatment — unlike sanitary sewer water, which goes to a treatment plant. Detergent, oil residue from a driveway, and dirt-laden runoff sent straight into a storm drain becomes pollution in local creeks and rivers, which is the entire reason the rule exists. It's regulated under the city's Municipal Separate Storm Sewer System (MS4) permit program.
What This Means in Practice for a Homeowner
For a simple water-only rinse of a driveway with minimal debris, the practical risk is low. But once you're using a cleaning solution, degreaser, or cleaning up something like an oil stain, that runoff shouldn't be allowed to flow freely into a street storm drain. Best practice — and what we do on every job — is containing and properly directing wastewater rather than letting it run downhill into the nearest drain.
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How Professionals Handle This Differently
Professional equipment and technique can direct, contain, or filter wastewater rather than letting it sheet off into the street. This is one of the genuine value differences between a DIY driveway cleaning and hiring it out — not just results, but compliance. It's also a good question to ask when choosing a pressure washing company: how do they handle runoff?
What About Commercial Properties?
Commercial and multi-unit properties face more scrutiny here than a single-family driveway, since larger paved areas generate more runoff volume. If you manage a commercial lot, see our deeper dive in where does pressure washing wastewater go?
The Bottom Line
Wash away — just be thoughtful about where the water ends up, especially if you're using any cleaning chemicals. We handle wastewater responsibly on every job throughout Indianapolis and suburbs like Zionsville, so it's one less thing you need to think about.