Somewhere below the tax line items on many Indiana property tax statements sits a charge labeled something like DITCH, DRAIN, or DRAINAGE ASSESSMENT. It's usually small — often a flat minimum of a few dollars, sometimes hundreds on farm acreage — and it generates a disproportionate share of taxpayer confusion, especially from owners who thought the circuit-breaker caps put a hard ceiling on their bill.
They did — on the taxes. The ditch assessment isn't a tax. Here's what it is, who sets it, and what to do if yours looks wrong.
What a Drainage Assessment Is
Indiana's 1965 Drainage Code (Ind. Code 36-9-27) makes counties responsible for regulated drains — the network of open ditches and underground tiles, much of it dug a century ago, that keeps Indiana's famously flat, wet land farmable and buildable. Two bodies run the system:
- The county drainage board (typically the county commissioners) adopts maintenance schedules and assessments.
- The county surveyor does the technical work: inspections, engineering studies, and specifications for repairs — clearing blockages, replacing collapsed tile, stabilizing banks.
The money comes from the parcels the drain serves. Each regulated drain has its own maintenance fund, filled by annual assessments on every benefited parcel in its watershed, per the State Board of Accounts' public drainage fund rules. Larger one-time reconstruction assessments fund full rebuilds.
In the statute's framing, these are user charges, not taxes: you're paying for a drainage service benefiting your specific parcel, the way a utility bill pays for water.
Why It Rides on the Tax Bill
Convenience, purely. The drainage board certifies its assessment roll (the "ditch duplicate") to the treasurer, and the charges are collected semi-annually alongside the May and November installments on the same statement. That combined presentation is why most people assume it's another tax. The plumbing matters, though, because collection is the only thing drainage charges share with property taxes:
| Property tax | Drainage assessment | |
|---|---|---|
| Set by | Tax rates × assessed value | Drainage board, per benefited parcel |
| Reduced by homestead and other deductions | Yes | No |
| Subject to 1%/2%/3% circuit-breaker caps | Yes | No |
| Contest via | Form 130 / PTABOA appeal | Drainage board hearing |
| Nonpayment consequence | Penalties, tax sale | Penalties, and delinquent drainage charges follow the parcel into the same enforcement pipeline |
That third row answers the perennial question: "my bill is over my cap — how?" The cap limits tax liability as a share of gross assessed value. Drainage assessments, along with certain other non-tax charges counties place on statements (solid waste and stormwater fees in some jurisdictions), sit outside the cap. Our guide on reading your tax bill shows where these lines live on the TS-1.
How the Amounts Are Set
Assessments are apportioned by benefit, which in practice usually tracks acreage in the drain's watershed, with minimum charges per parcel. Two practical consequences:
- Small urban lots typically pay a flat minimum — a nuisance-level charge that isn't worth contesting.
- Farmland pays by the acre, and a reconstruction project on a major drain can add a real, multi-year line to the cost of owning ground in that watershed. If you farm, the drainage board's public hearings on maintenance and reconstruction schedules are worth actually attending — assessments are set there, not at the assessor's office.
Note
An appeal of your assessed value — even a successful one — does not change your drainage assessment, because it was never calculated from your assessed value. Conversely, a drainage charge you think is wrong (wrong acreage, parcel not actually in the watershed, benefit misallocated) is raised with the drainage board, typically at or after the hearing where the roll is adopted. Form 130 can't reach it.
What to Check on Your Parcel
- Find the line. Pull your statement and look below the tax section for ditch/drainage charges, then identify which regulated drain it funds — the county surveyor's office can tell you from your parcel number.
- Check the acreage. If you're assessed by the acre, confirm the acreage matches your parcel — our property lookup shows the parcel's recorded acreage, and mismatches between drainage rolls and current parcel splits are a known error source after land divisions.
- Watch for reconstruction notices. A pending reconstruction petition on your drain means a hearing, and a hearing means the window to be heard on how the cost is spread.
- Don't skip paying it in a dispute. Drainage charges are collected with the installment; shorting the payment triggers the same delinquency machinery as unpaid tax. Pay, then contest.
If the tax portion of your bill is the real problem, that's the part with a formal remedy — start with the Indiana property tax appeal guide.