Rainwater collection is one of the most common reasons homeowners buy IBC totes from us. It is also one of the most legally confusing topics in the region because the rules vary state by state and the urban myths around western-state restrictions get incorrectly attached to Midwest jurisdictions. The short version: across the central Midwest, residential rainwater collection is essentially unregulated for landscape and garden use. The longer version has some nuances worth knowing.
Missouri
Missouri has no state-level restriction on residential rainwater collection. The state actively encourages it through cost-share programs administered through the Department of Natural Resources for certain agricultural applications. Local municipal rules apply for any system tied into a building plumbing system — Columbia, Springfield, and Kansas City all require a licensed plumber for indoor potable connections. Outdoor landscape use is unrestricted.
Kansas
Kansas water rights law is complex on paper but practically unrestrictive for residential rainwater collection at typical scales. The state Water Appropriations Act technically applies, but residential collection volumes are well under any practical threshold for enforcement. Larger agricultural collection — say, an irrigation pond filled by directed runoff — requires a beneficial use permit. Tote-based systems for garden and livestock watering have never, to our knowledge, required permitting.
Iowa, Illinois, Arkansas
Iowa and Illinois have no state-level rainwater collection restrictions. Arkansas similarly has no restriction and active encouragement through several cost-share and tax-credit programs for cisterns and other collection infrastructure. In all three states, indoor plumbing connections require code-compliant installation, but outdoor systems are unrestricted.
- Missouri: unrestricted outdoor, code-compliant indoor
- Kansas: unrestricted at residential scale, permit for large ag
- Iowa: unrestricted
- Illinois: unrestricted
- Arkansas: unrestricted, with cost-share programs available
Where the rules tighten
Indoor potable use — where collected rainwater is plumbed into a building water system for drinking, washing, or cooking — is regulated everywhere in the Midwest and requires a code-compliant installation including treatment, backflow prevention, and inspection. That is a meaningfully different project than an outdoor garden system, and homeowners considering it should plan on involving a licensed plumber from day one rather than retrofitting an existing tote array later.