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Storm Water Utility Report City of Lino Lakes, MN WSB Project No. 017518-000 Page 3 3. STORM WATER UTILITY FEE DETERMINATION This section outlines the methodology to determine a just and equitable SWU fee that meets the City’s needs to maintain and improve their storm water system. In general, parcels with higher percentages of impervious surface, which generate larger volumes of stormwater runoff, will be charged higher fees. 3.1 Land Use & Impervious Coverage Determination A combination of the City’s existing (2017) land use designations, (2020) Anoka County aerial imagery, and the most recent (2021) parcel data was used to determine the 2021 existing land use designations for each parcel (Figure 1). Impervious areas throughout the City were digitized, based on (2017) USDA Farm Service Agency and (2020) Anoka County aerial imagery. From this, the impervious area was computed for each parcel. 3.2 SWU Fees & Estimated Revenue The SWU fee was determined for each parcel based on land use and impervious coverage. Land uses fall into one of three categories, residential, non-residential, and exempt. Residential parcels (single family, multi-family, and rural residential) are all charged per parcel at the residential base fee. The residential base fee is computed as follows: 𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅 𝐵𝐵𝑅𝑅𝑅𝑅𝑅𝑅 𝐹𝐹𝑅𝑅𝑅𝑅= 𝐼𝐼𝐼𝐼𝐼𝐼𝑅𝑅𝐼𝐼𝐼𝐼𝑅𝑅𝐼𝐼𝐼𝐼𝑅𝑅 𝑅𝑅𝐼𝐼𝑅𝑅𝑅𝑅 𝐼𝐼𝑅𝑅 𝐼𝐼𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅 𝐼𝐼𝑅𝑅𝐼𝐼𝑝𝑝𝑅𝑅𝑅𝑅𝑅𝑅𝑇𝑇𝐼𝐼𝑅𝑅𝑅𝑅𝑅𝑅 𝑅𝑅𝐼𝐼𝐼𝐼𝑅𝑅𝐼𝐼𝐼𝐼𝑅𝑅𝐼𝐼𝐼𝐼𝑅𝑅 𝑅𝑅𝐼𝐼𝑅𝑅𝑅𝑅 ∗𝐴𝐴𝑅𝑅𝑅𝑅𝐼𝐼𝑅𝑅𝑅𝑅 𝑏𝑏𝐼𝐼𝑅𝑅𝑏𝑏𝑅𝑅𝑅𝑅𝑁𝑁𝐼𝐼𝐼𝐼𝑏𝑏𝑅𝑅𝐼𝐼 𝐼𝐼𝑜𝑜 𝐼𝐼𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅 𝐼𝐼𝑅𝑅𝐼𝐼𝑝𝑝𝑅𝑅𝑅𝑅𝑅𝑅 Non-residential parcels are charged per acre of impervious area on each individual parcel. The non-residential base fee is computed as follows: 𝑁𝑁𝐼𝐼𝑅𝑅−𝐼𝐼𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅 𝑏𝑏𝑅𝑅𝑅𝑅𝑅𝑅 𝑜𝑜𝑅𝑅𝑅𝑅= (𝐴𝐴𝑅𝑅𝑅𝑅𝐼𝐼𝑅𝑅𝑅𝑅 𝑏𝑏𝐼𝐼𝑅𝑅𝑏𝑏𝑅𝑅𝑅𝑅− 𝐴𝐴𝑅𝑅𝑅𝑅𝐼𝐼𝑅𝑅𝑅𝑅 𝑜𝑜𝑅𝑅𝑅𝑅 𝑜𝑜𝐼𝐼𝐼𝐼𝐼𝐼 𝐼𝐼𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅 𝐼𝐼𝑅𝑅𝐼𝐼𝑝𝑝𝑅𝑅𝑅𝑅𝑅𝑅)𝑇𝑇𝐼𝐼𝑅𝑅𝑅𝑅𝑅𝑅 𝑅𝑅𝐼𝐼𝐼𝐼𝑅𝑅𝐼𝐼𝐼𝐼𝑅𝑅𝐼𝐼𝐼𝐼𝑅𝑅 𝑅𝑅𝐼𝐼𝑅𝑅𝑅𝑅 𝐼𝐼𝑜𝑜 𝑅𝑅𝐼𝐼𝑅𝑅−𝐼𝐼𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅 𝐼𝐼𝑅𝑅𝐼𝐼𝑝𝑝𝑅𝑅𝑅𝑅𝑅𝑅 The minimum non-residential base fee is equal to the residential base fee ($12 per parcel per quarter). Therefore, the computed fee was adjusted to account for the increase in expected revenue due to the minimum fee and the decrease in expected revenue due to anticipated credits as described in Section 3.3. Note that in both residential and non-residential computations, parcels that are exempt from the SWU fee are not included in the calculations. The proposed fee for each land use is shown in Table 2. The proposed residential base fee is $12 per quarter or $48 per year. The proposed non-residential base fee is $175 per impervious acre per quarter or $700 per impervious acre per year, with a minimum fee equal to the residential base fee. With the existing land use and parcel designations, this framework is anticipated to generate approximately $583,000 for the City’s SWU fund (if all existing best management practices (BMPs) are leveraged to receive a credit, as described in Section 3.3, the total revenue generated would be reduced by approximately $35,500). Figure 2 shows the proposed SWU fee by parcel. Figure 3 shows the parcels with proposed SWU fees that are not currently paying a utility fee and would generate a new utility billing account.