Waterloo, Iowa Basement Waterproofing Guide (2026)

Updated October 25, 2026. This guide is general information, not legal or engineering advice. Rules change, so confirm with the agency listed before you start work.

Quick reference

Topic	What to know	Source
Soils	Poorly drained soils and filled drainageways are likely to have wet basements	Black Hawk County soil survey
Precipitation	About 36 inches of precipitation and 39 inches of snow a year (1991 to 2020)	NOAA normals via Wikipedia
Sewer agreement	Waterloo must finish footing drain removal; sewer work due by Dec. 31, 2032	U.S. EPA; U.S. Attorney's Office
Contractor registration	Required if earning $2,000 or more a year in construction in Iowa	Iowa Division of Labor
Waterloo permits	Building Department, 715 Mulberry St.; the hired contractor should obtain permits	City of Waterloo
Before digging	Contact Iowa One Call (811) at least two business days ahead	Iowa Utilities Commission
Canceling an at-home sale	Until midnight of the third business day for most sales of $25 or more	Federal Trade Commission
Indoor humidity	Below 60%, ideally 30% to 50%	U.S. EPA

Why do Black Hawk County basements leak?

The 1978 Soil Survey of Black Hawk County describes upland soils formed in loess, sometimes more than 40 inches thick and elsewhere 24 to 40 inches thick over glacial till, usually with a stone line or pebble band between them. Water can collect at that till contact and create wet, seepy spots in some years. On benches near the river, the survey describes urban land that is mostly poorly drained with a high water table, where cutting and filling have changed the original drainage. Its plain warning: houses built on these poorly drained soils, or on modified drainageways, are likely to have wet basements. The survey also notes that soil properties vary enough that onsite investigation is needed for any specific site.

How much water does the area get?

Under the 1991 to 2020 normals for Waterloo Regional Airport, the city averages about 36.3 inches of precipitation and about 39 inches of snow a year. Spring melt and summer thunderstorms are when most basements show their weak spots. The June 2008 flood was the worst on record for the metro; the Cedar River at Waterloo peaked at 112,000 cubic feet per second on June 11, and KWWL reported the river in Cedar Falls crested about 13 feet above flood stage on June 10.

What does Waterloo's sewer agreement mean for my sump pump?

In October 2015, the U.S. Attorney's Office, the EPA and the State of Iowa announced a proposed consent decree with the City of Waterloo over sanitary sewer overflows, including discharges to the Cedar River and sewage backups into homes and businesses. The city, which has about 400 miles of sanitary sewer, agreed to pay $272,000, to complete a footing drain removal program it had already begun, and to finish its approved sewer improvements by December 31, 2032. Trade press reported in August 2015 that nearly 1,000 homes in the first target area had disconnected foundation drains from the sanitary sewer and installed sump pumps, and that the city had seen no sewer overloads from those connections in the months since, after 20 in 2014.

The practical result: more Waterloo basements depend on a sump pump, and that water has to go somewhere outside. A University of Iowa capstone project for the city in 2020 and 2021 noted that sump discharge onto streets and neighbors' lots in south Waterloo was causing ice and algae, and proposed curbside drain tile for pumps to connect to. Ask the city what's available on your street.

Who can do the work?

According to the Iowa Division of Labor, contractors and businesses that do construction work and earn $2,000 or more a year from it in Iowa must register, and contractors based outside Iowa must also file a bond. The City of Waterloo's permit guidance repeats that all construction contractors, including special trades, must register with the state. Registration isn't a license or a promise of quality, so still ask for references and a detailed written scope.

Do I need a permit?

The Waterloo Building Department administers residential and commercial construction and takes permit applications online. It reminds residents that when they hire a contractor, the contractor should obtain the required permits. Plumbing and electrical parts of a waterproofing job, such as a new pump circuit, may need their own permits. Cedar Falls, Evansdale and Hudson each run their own permit process.

What about digging outside?

The Iowa Utilities Commission says Iowa law requires any resident or excavator to contact 811 or Iowa One Call at least two business days before digging, and recommends calling at least 48 hours ahead. Exterior waterproofing, footing drains, buried downspout lines and new discharge lines all count.

Signed a contract at home?

The Federal Trade Commission's Cooling-Off Rule generally lets you cancel a sale of $25 or more made at your home until midnight of the third business day after the sale. Saturdays count as business days; Sundays and federal holidays don't.

How dry should the basement be?

The U.S. EPA recommends keeping indoor humidity below 60 percent, ideally between 30 and 50 percent, and drying water-damaged areas within 24 to 48 hours to prevent mold. It also recommends making sure the ground slopes away from the foundation and keeping gutters clean and repaired.

Questions to ask a waterproofing company

Are you registered with the Iowa Division of Labor?
Where is the water getting in, and how does your plan address that?
Where will the sump or drain water discharge outside, and where will it go in winter?
Does any part of this need a permit, and will you pull it?
What happens to the plan and price if you find structural damage?
What does the warranty cover, for how long, and does it transfer?

Common questions

Do basement waterproofing contractors have to register in Iowa?

Yes, if they earn $2,000 or more a year from construction work in Iowa. They register with the Iowa Division of Labor, and you can check the state's registered contractor search.

Why does my Waterloo house have a newer sump pump?

It may have been part of the city's footing drain removal work, which disconnected foundation drains from the sanitary sewer and replaced that path with a sump pump. The city or a waterproofing company can confirm how your drains are set up.

How far ahead do I need to call 811 in Iowa?

Iowa law requires at least two business days' notice to Iowa One Call before digging, and the Iowa Utilities Commission recommends calling at least 48 hours ahead.

Waterloo, Iowa basement waterproofing guide (2026)