Spring is when Bloomington basements show their weak spots. Heavy rain falls on thawing, saturated ground, and in our part of Indiana that water doesn't always behave the way you'd expect. This checklist covers the things a homeowner can check in an afternoon, explains why local geology matters, and lists the official city resources for drainage problems that start outside your property line.
Why Bloomington is different: karst
The City of Bloomington Utilities' stormwater education page notes that Bloomington and the surrounding area contain karst. Karst is landscape formed on limestone and other soluble rock, where drainage is largely diverted underground and the land is marked by sinkholes, sinking streams, large springs and caves (the city quotes the Indiana Karst Conservancy's definition).
What that means for a basement:
- Water can travel in unexpected directions. Runoff that disappears into the ground uphill can show up somewhere else, including against a foundation wall.
- Concentrated runoff matters. A downspout or driveway that dumps water in one spot can soften soil and, in karst areas, wash it out over time.
- Don't treat a sinkhole as a drain. Avoid filling a depression with debris or routing water into it without advice. If a depression is forming or growing near your house, take it seriously and get professional advice. A sudden one near the street is worth reporting to the city.
The outside checklist
Walk the house on a rainy day if you can. That's when problems are easiest to see.
- Gutters are clear of leaves and seed pods and aren't overflowing at the corners.
- Downspouts discharge well away from the foundation. Use extensions or splash blocks, and make sure the water then flows away from the house rather than back toward it or onto a neighbor's lot.
- Soil slopes away from the house. Settled backfill along foundation walls is common. Low spots that pond water against the wall are a top cause of seepage.
- Window wells are clear of leaves, with drains working and covers in place where needed. (See our egress windows and window wells page.)
- Driveway and patio slabs haven't settled toward the house.
- No new depressions in the yard, especially after heavy rain.
- Storm inlets near your home aren't clogged. Clearing a blocked street inlet helps the whole block. The city runs an Adopt-a-Drain volunteer program for this.
The inside checklist
- Test the sump pump. Pour a bucket of water into the pit and confirm the pump starts, empties the pit and shuts off. Check that the discharge line outside isn't frozen, crushed or clogged.
- Consider a battery backup if you've ever had water during a power outage. (See our sump pump repair and battery backup page.)
- Look for early signs: white mineral deposits (efflorescence), damp lines where the floor meets the wall, musty smells, peeling paint or rust on appliance feet.
- Mark existing cracks with a pencil and date. If they grow or start to leak, that's useful information for whoever looks at them.
- Run a dehumidifier if the basement feels damp, and empty or drain it regularly.
- Store valuables off the floor in plastic bins, not cardboard.
Where the city can help
Some water problems start at the street or the neighborhood level, not at your house. The City of Bloomington Utilities (CBU) Stormwater program is the place to start. Its stormwater page lists:
- CBU: 600 E. Miller Dr., Bloomington, 812-339-1444
- MS4 Program Coordinator: 812-349-3637
- Stormwater Education Specialist: 812-349-3617
- Report a concern: through the city's uReport site
Residential Stormwater Grants
CBU has offered small Residential Stormwater Grants for sustainable drainage projects on private residential property, such as rain gardens, bioswales, dry creek beds and drainage stabilization. According to the city's 2024 announcement, projects involving more than one property or in Census-designated low-income areas were preferred, and only the parts of a project that improve stormwater were funded. The city suggested starting early because planning and meeting contractors takes time. Check the Stormwater Resources for Homeowners page for the current round and deadline.
Neighborhood visits and education
The same page says CBU is bringing back neighborhood presentations and site visits on drainage and erosion, and is building an education series for residents, neighborhood associations and HOAs. Neighborhood associations can contact CBU to ask about a visit.
When it's time to call a pro
Call someone if:
- Water comes in through a crack or the floor-wall joint during most heavy rains
- A wall is bowing, or cracks are widening
- The sump pump runs constantly or can't keep up
- Fixing grading and downspouts hasn't solved the problem
Related pages: wet basement leak repair and yard drainage and French drains.
FAQ
Why does karst matter for my basement?
Karst drains water underground through sinkholes and springs, so runoff paths can be hard to predict. That makes managing roof and surface water around your foundation even more important.
Who do I call about street or neighborhood drainage in Bloomington?
City of Bloomington Utilities Stormwater, 812-339-1444, or report it through the city's uReport site.
Does the city help pay for yard drainage projects?
CBU has run a Residential Stormwater Grants program for projects like rain gardens and bioswales. Check the city's stormwater page for the current round.
When should I test my sump pump?
Before the spring rains, and again after any long power outage.
Still getting water?
Bloomington Basement Waterproofing is a local referral service. We pass your request to an independent local waterproofing contractor, who contacts you directly. Call (317) 798-0634 or use the quote form.
Last checked: October 2026. City details come from City of Bloomington Utilities. Confirm current programs with the city.