Map of Stormwater Utilities in Iowa
The following examples of stormwater utility rates show calculations by several different methods. These rates are current as of May 2006.
Note: Impervious area is measured in Equivalent Residential Units (ERU). The average impervious area (square feet or acres) for residential properties in the given city is represented by one ERU.
| City | Residential Rates | All Other Properties Rates | Connection Charge (Residential) |
| Ames | $2.25/mo for single family; $1/unit for multi-structure | Commercial $2.25/mo base rate .75/ERU up to 3,129 | none |
| Bettendorf | ERU=$1.5/mo for 2,500 sq ft imperv. Cap is 12,500 sp ft imperv. | ERU=$1.5/mo for 2,500 sq ft imperv. No limit on imperv. | none |
| Boone | ERU=$2/mo for up to 6,000 sq ft imperv. | ERU=$2/mo for 3,000 sq ft imperv. | none |
| Buffalo | $2/mo for all | $2/mo for all | none |
| Burlington | $2/mo | Commercial $10/25,000 sq. ft. | none |
| Carroll | $3/mo | School $25/mo; Church $10/mo; Commercial $3/mo (max $50) | none |
| Coralville | $2/mo/ERU flat rate | N/A | none |
| Davenport | $1.60/mo for single family; $0.80/unit for duplex |
Non-Residential $1.60/mo per ERU 1ERU = 2600 sq feet impervious |
none (offers credits to non-res. and K-12 education) |
| Des Moines, IA | Please see separate table below. | ||
| DeWitt | $2.50/mo | Comm;Ed;Gov't;Religious $6/mo Industrial $10/mo |
none |
| Dubuque | $1.79 per SFU (1 SFU=2,917 sq. ft. imperv.) |
N/A | none |
| Forest City | $5.00/mo | $8.30/mo | none |
| Hiawatha | $1.00/mo | $1.50/mo | none |
| Iowa City | $2/mo for single family; $1/unit for multi-structure | Commercial: $2 base + ($0.75/ERU)/mo. ERU = 3,129 sq. ft. of impervious area |
none |
| Sioux City | Use Runoff Weighting Factor RWF X sq. ft. X $.00028 (Residential RWF = 7.5) |
Same formula - RWFs vary from .06 (ag) to 18.75 (retail) |
none |
| State Center | $3.00/mo | Comm;Ed;Gov't;Religious $6/mo Industrial $10/mo |
none |
| Waukee | $2.75 includes single family homes, horizontally attached townhomes and duplex dwellings | $2.75/ERU (=2973 sf) with rate rounded to nearest ERU over 0.5 units | none |
| Des Moines - 1 ERU = 2,349 square feet of impervious area and one ERU is presently approximately $5.83. | |
| Impervious Area | % of ERU Rate |
| 1,400 sq ft or less | 50% |
| 1,401 to 4,900 sq ft | 100% |
| 4,901 sq ft or greater | 150% |