Printed: 1/7/2024
APPENDIX D: WASTEWATER COST-OF-SERVICE ANALYSIS
City of Rialto - 2024 Water and Wastewater Rate Study
Wastewater Cost-of-Service Analysis Tables
35 Less Non-Rate Revenues
36 Fines/Forfeitures/Penalties ($2,000) $0 $0 $0 ($2,000) $0 $0 4 Direct: Admin 37 Rents and Concessions (Anaergia Lease) $0 $0 $0 $0 $0 $0 $0 1 Direct: Treatment 38 Trustee Interest Income ($100,000) $0 $0 $0 ($100,000) $0 $0 4 Direct: Admin 39 Delinquent Sewer Service Fees ($200,000) $0 $0 $0 ($200,000) $0 $0 4 Direct: Admin 40 Grants ($370,000) ($370,000) $0 $0 $0 $0 $0 1 Direct: Treatment 41 Effluent Sale to IEUA ($144,375) $0 $0 $0 $0 $0 ($144,375) 6 Direct: RNHC 42 Less Interest Income on RUA Reserves ($3,930) $0 $0 $0 ($3,930) $0 $0 4 Direct: Admin 43 Plus Change Reserve Balances 89,387 $42,278 $11,037 $970 $35,204 $352 ($454) 15 Rate Revenue Requirement 44 Total $28,513,183$13,486,122$3,520,759 $309,434$11,229,423 $112,272 ($144,829) 45 46 Compare With Operating Statement$28,513,183
TABLE D-7
Wastewater COSA - Allocation of Rate Revenue Requirement TY FY 23/24 Total $
Line Total ($) Flow BOD TSS CustomerDirect: CIII,CIV Flow BOD TSS Customer Direct: CIII,CIV 1 Treatment $13,486,122 4,495,374 4,495,374 4,495,374 0 0 33.3% 33.3% 33.3% 0.0% 0.0% 2 Collection $3,520,759 3,520,759 0 0 0 0 100.0% 0.0% 0.0% 0.0% 0.0% 3 Customer $309,434 0 0 0 309,434 0 0.0% 0.0% 0.0% 100.0% 0.0% 4 Administration $11,229,423 5,164,879 2,896,417 2,896,417 199,372 72,338 46.0% 25.8% 25.8% 1.8% 0.6% 5 Direct Assign: Commercial III and IV $112,272 0 0 0 0 112,272 0.0% 0.0% 0.0% 0.0% 100.0% 6 Direct Assign: RNHC ($144,829) (144,829) 0 0 0 0 100.0% 0.0% 0.0% 0.0% 0.0% 7 Total Rate Revenue Requirement $28,513,181$13,036,183$7,391,791 $7,391,791 $508,806 $184,610 8 9 Adj. for Fontana Extraterritorial Revenue($1,878,975) ($864,219) ($484,646) ($484,646) ($33,360) ($12,104) 10 Rate Rev. Req. from City Direct Customers$26,634,206$12,171,964$6,907,145 $6,907,145 $475,446 $172,506 11 12 Adjustment for Full Year Implementation$553,922$253,145.20$143,650.65$143,650.65 $9,888.03 $3,587.68 13 Full Year Implementation Rev Req $27,188,128$12,425,109$7,050,796 $7,050,796 $485,334 $176,094 Methodology: Extraterritorial customers are not part of the City's billing data, and therefore the billing determinants (flow, BOD, TSS, number of customers) are not available from the City.
The extraterritorial revenue is subtracted so this table contains an allocated Rate Revenue Requirement from City direct customers. 01082024 Rialto Rate Model DraftD1-D8 FG Solutions, LLC Copyright 2024 All Rights Reservved
Draft
Printed: 1/7/2024
APPENDIX D: WASTEWATER COST-OF-SERVICE ANALYSIS
City of Rialto - 2024 Water and Wastewater Rate Study
Wastewater Cost-of-Service Analysis Tables
TABLE D-8
Wastewater COSA - Distribution of Rate Revenue Requirement TY FY 23/24TY FY 23/24
Full Year Full Year
Direct: ImplementationImplementationNo. of Billing
Line Flow BOD TSS Customer C III, C IV Total ($) As PercentDeterminants 1 Rate Revenue Requirement $12,425,109$7,050,796 $7,050,796 $485,334 $176,094 $27,188,128 2 Units of Service 27,188,128 100.00%
3 Amount (1) 3,400,386 7,813,429 7,660,797 20,639 184,695 4 Units hcf Sewer Flow lbs lbs accounts C III, C IV hcf 5 Unit Cost-of-Service, $/unit
6 Unadjusted $3.65 $0.90 $0.92 $23.52 $0.95
7 8 Allocation to Customers
9 Residential 1.3X
10 Units of Service 12,872 34,203 34,203 138 0
11 Percentage of Service 0% 0% 0% 1% 0%
12 Cost of Service $47,033 $30,865 $31,480 $3,241 $0 $112,618 0.41% 13 14 Residential, Combined SF and MFR
15 Units of Service 2,514,720 6,386,440 6,386,440 19,659 $0 16 Percentage of Service 74% 82% 83% 95% 0%
17 Cost of Service $9,188,858 $5,763,088 $5,877,911 $462,285 $0 $21,292,143 26,923 18 19 Commercial, Group II
20 Units of Service 599,336 561,121 561,121 539
21 Percentage of Service 18% 7% 7% 3% 0%
22 Cost of Service $2,189,992 $506,352 $516,441 $12,663 $0 $3,225,447 11.86% 599,336 23 24 Commercial, Group III
25 Units of Service 78,474 146,940 146,940 160 78,474
26 Percentage of Service 2% 2% 2% 1% 42%
27 Cost of Service $286,746 $132,598 $135,240 $3,751 $74,819 $633,154 2.33% 78,474 28 29 Commercial, Group IV
30 Units of Service 106,221 596,689 464,092 134 106,221 31 Percentage of Service 3% 8% 6% 1% 58%
32 Cost of Service $388,135 $538,449 $427,138 $3,159 $101,274 $1,458,156 5.36% 106,221 33 34 Schools, S1 and S4
35 Units of Service 21,216 17,214 13,242
36 Percentage of Service 0.6% 0.2% 0.2%
37 Cost of Service $77,522 $15,534 $12,187 $105,244 0.39% 38 39 Schools, S2
40 Units of Service 63,666 51,659 39,737
41 Percentage of Service 1.9% 0.7% 0.5%
42 Cost of Service $232,637 $46,617 $36,573 $315,826 1.16% 01082024 Rialto Rate Model DraftD1-D8 FG Solutions, LLC Copyright 2024 All Rights Reservved
Draft
Printed: 1/7/2024
APPENDIX D: WASTEWATER COST-OF-SERVICE ANALYSIS
City of Rialto - 2024 Water and Wastewater Rate Study
Wastewater Cost-of-Service Analysis Tables
43 44 Sewer - Commercial II X 1.3
45 Units of Service 565 529 529 4
46 Percentage of Service 0.0% 0.0% 0.0% 0.0%
47 Cost of Service $2,066 $478 $487 $94 $3,125 0.01%
48 49 Sewer - Commercial IV X 1.3
50 Units of Service 3,317 18,633 14,492 6
51 Percentage of Service 0.1% 0.2% 0.2% 0.0%
52 Cost of Service $12,121 $16,815 $13,339 $141 $42,415 0.16% 53 54 Total 3,400,386 7,813,429 7,660,797 20,639 184,695 01082024 Rialto Rate Model DraftD1-D8 FG Solutions, LLC Copyright 2024 All Rights Reservved
Draft
Printed: 1/7/2024
2023 Water and Wastewater Rate Study – City of Rialto
1 01112024 RIALTO Rate Study Report DRAFT
Appendix E: Wastewater Rate Design
APPENDIX E: WASTEWATER RATE DESIGN
TABLE E-1
City of Rialto - 2024 Water and Wastewater Rate Study
Wastewater Rate Design Calculations
1 1. Key Sewer Rate Design Assumptions
2 People per Household, Residential 3.86 https://www.census.gov/quickfacts/fact/table/rialtocitycalifornia/PST045222 3 Applicable to Single-Family Residential and Multi-Family Residential, 4 per policy direction from City staff 11/15/23
5 Per capita BOD, lb/d 0.17
6 Per capita TSS, lb/d 0.17
7 How Water Conservation Trends Are Challenging Wastewater Treatment Facility Design Standards - Integrated Water Services 8 https://www.climate-policy-watcher.org/wastewater-treatment-3/population-equivalent-or-unit-loading-factor.html; Ten States Standards (2013 Version) 9 10
11 12 2. Compile CY 2022 Monthly Sewer Revenues
13 14 2022 2022 2022 2022 2022 2022 2022 2022 2022 2022 2022 2022 15 Rate Code Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Total 16 SC2 $318,807 $308,696 $314,688 $343,731 $335,986 $332,990 $378,446 $352,293 $347,744 $374,071 $336,790 $313,264 $4,057,506 17 SC3 $55,588 $48,547 $47,929 $54,648 $57,766 $49,356 $58,513 $48,244 $51,841 $60,773 $45,572 $45,876 $624,652 18 SC4 $86,898 $77,308 $74,444 $93,742 $86,821 $84,010 $105,730 $85,649 $97,867 $120,474 $91,197 $76,130 $1,080,270 19 SNB $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0
20 SR1 $1,175,880 $1,179,411 $1,179,774 $1,178,888 $1,178,764 $1,179,278 $1,178,696 $1,181,211 $1,181,860 $1,182,964 $1,182,255 $1,182,303$14,161,283 21 SR2 $11,140 $11,140 $11,140 $11,140 $11,140 $11,140 $11,140 $11,137 $11,148 $11,140 $11,140 $11,140 $133,682 22 SR3 $493,710 $493,444 $493,706 $493,728 $493,621 $493,480 $493,664 $493,664 $493,664 $493,695 $499,311 $495,211 $5,930,899 23 SR4 $124 $124 $174 $124 $187 $187 $187 $187 $187 $187 $187 $187 $2,040 24 SR5 $560 $560 $560 $560 $560 $560 $560 $560 $560 $560 $560 $560 $6,717 25 SR6 $1,351 $1,351 $1,351 $1,351 $1,351 $1,351 $1,351 $1,351 $1,351 $1,351 $1,351 $1,351 $16,209 26 SS1 $6,412 $6,412 $6,412 $6,412 $6,412 $6,412 $6,412 $6,412 $6,412 $6,412 $6,268 $6,308 $76,691 27 SS2 $21,699 $21,699 $21,699 $21,699 $21,699 $21,699 $21,699 $21,699 $21,699 $21,699 $21,699 $19,108 $257,794 28 SS4 $430 $430 $430 $430 $430 $430 $430 $430 $430 $430 $430 $328 $5,059 29 SX2 $427 $399 $391 $408 $401 $408 $435 $443 $383 $461 $419 $401 $4,976 30 SX4 $3,148 $3,280 $2,580 $3,399 $4,060 $4,323 $6,690 $4,138 $2,844 $3,743 $3,175 $2,474 $43,855 31 Total $2,176,173 $2,152,801 $2,155,275 $2,210,259 $2,199,196 $2,185,623 $2,263,950 $2,207,417 $2,217,989 $2,277,957 $2,200,351 $2,154,640$26,401,632 32 33
34 Methodology/Source:
35 1. Use file Billing With Consumption July 2022 to Dec 2022, and Billing With Consumption Jan 2022 to Jun 2022; provided by Veolia (R Lee) on 6/16/23. 36 2. Pivot table:
37 rows: Bill Code
38 Columns: C_Year, C_Month, C_BillDesc, SumValues
39 Data: Sum of Y_Charges
40 41
01082024 Rialto Rate Model Draft
E1WWRateDesign
FG Solutions, LLC
Copyright 2024 All Rights Reservved
Draft
1/7/2024
APPENDIX E: WASTEWATER RATE DESIGN
42 3. CY 22 Number of Billing Determinants
43 44 CY 2022 Number of Billing Determinants Based on Revenues 45 Current Number ofInterim Data:
46 Rate CY 22 Sewer Residential Avg CY 22 No. of Students 47 Rate Code Description Code Revenues Rate Units Flow, ccf Units Bills # of AccountsPupil Months 48 Sewer - Residential SR1 14,161,283 $62.19$/mo/unit 18,976 18,976 49 Sewer - Residential X 1.3 SR2 133,682 $80.84$/mo/unit 138 138 50 Sewer - Residential Multi. SR3 5,930,899 $62.19$/mo/unit 7,947 683 54 Sewer - Commercial II SC2 4,057,506 $6.77$/ccf 599,336 6,462 539 55 Sewer - Commercial III SC3 624,652 $7.96$/ccf 78,474 1,914 160 56 Sewer - Commercial IV SC4 1,080,270 $10.17$/ccf 106,221 1,612 134 57 Sewer - School - Elementary SS1 76,691 $0.85$/pupil 16 90,225 58 Sewer - School - Junior High SS2 257,794 $2.03$/pupil 10 126,992 59 Sewer - School - High SS3 0
60 Sewer - School - Continuation SS4 5,059 $0.85$/pupil 2 5,952 66 Sewer - Commercial II X 1.3 SX2 4,976 $8.80$/ccf 565 48 4 68 Sewer - Commercial IV X 1.3 SX4 43,855 $13.22$/ccf 3,317 72 6 74 Total 26,376,667
75 76 4. CY 22 Flow, BOD, and TSS for Each Rate Class
77 78 Calculated
79 BOD BOD and TSS TSS BOD TSS Flow,
80 mg/L lb/pupil/day mg/L Flow, ccf/year lb/year lb/year gpd/student 81 Sewer - Residential SR1 N/A N/A 1,772,414 4,709,801 4,709,801 50 gpcd times 3.86 people per house 82 Sewer - Residential X 1.3 SR2 N/A N/A 12,872 34,203 34,203 50 gpcd times 3.86 people per house 83 Sewer - Residential Multi. SR3 N/A N/A 742,306 1,676,638 1,676,638 50 gpcd times 3.86 people per house 84 SR4 N/A N/A 0 0 0
85 SR5 N/A N/A 0 0 0
86 SR6 N/A N/A 0 0 0
87 Sewer - Commercial II SC2 150 150 599,336 561,121 561,121 Composite: industry standards and City's definition of customer class 88 Sewer - Commercial III SC3 300 300 78,474 146,940 146,940 Composite: industry standards and City's definition of customer class 89 Sewer - Commercial IV SC4 900 700 106,221 596,689 464,092 Composite: industry standards and City's definition of customer class 90 Sewer - School - Elementary SS1 130 0.009 100 19,903 16,149 12,422 11 www.pollutioncontrolsystem.com/Uploads/images/Pages/SEWAGE%20FLOW%20RATE%20ESTIMATING%20GUIDE%20Nov%202014_20170105.pdf 91 Sewer - School - Junior High SS2 130 0.021 100 63,666 51,659 39,737 25 elementary, continuation: gpcd for classrooms. No cafeteria or showers 92 Sewer - School - High SS3 130 0.021 130 0 25 jr high and high: classrooms, cafeteria, and showers 93 Sewer - School - ContinuationSS4 130 0.009 100 1,313 1,065 819 11 180 days school per year 99 Sewer - Commercial II X 1.3 SX2 150 150 565 529 529
100 Sewer - Commercial III X 1.3 SX3 0
101 Sewer - Commercial IV X 1.3 SX4 900 700 3,317 18,633 14,492 107 Total 3,400,386 7,813,429 7,660,797
108
109 Flow, mgd 6,968,463
110 Compare with DMRs 6.92 5,998,637 5,337,629
111 1.3025340781.435243513
112
113
114 Residential - Single Family
115 Residential - Multi-Family
116
117
194
195
01082024 Rialto Rate Model Draft
E1WWRateDesign
FG Solutions, LLC
Copyright 2024 All Rights Reservved
Draft
1/7/2024
APPENDIX E: WASTEWATER RATE DESIGN
196 5. Projected Number of Billing Determinants
197
198
199 Rate Jul-Dec Projected (1)
200 Rate Code Description Code 2022 FY 23/24 FY 24/25 FY 25/26 FY 26/27 FY 27/28 201 Number of Customer Bills
202 Sewer - Residential SR1 18,976 19,071 19,166 19,262 19,358 19,455 203 Sewer - Residential X 1.3 SR2 138 138 139 140 141 142 204 Sewer - Residential Multi. SR3 7,947 7,987 8,027 8,067 8,107 8,148 205 Metered Water Consumption, ccf/year
206 Sewer - Commercial II SC2 599,336 602,333 605,345 608,372 611,414 614,471 207 Sewer - Commercial III SC3 78,474 78,866 79,260 79,656 80,054 80,454 208 Sewer - Commercial IV SC4 106,221 106,752 107,286 107,822 108,361 108,903 209 Sewer - Commercial II X 1.3 SX2 565 568 571 574 577 580 210 Sewer - Commercial III X 1.3 SX3
211 Sewer - Commercial IV X 1.3 SX4 3,317 3,334 3,351 3,368 3,385 3,402 212 Number of Pupils
213 Sewer - School - Elementary SS1 7,519 7,556 7,594 7,632 7,670 7,708 214 Sewer - School - Junior High SS2 10,583 10,636 10,689 10,742 10,796 10,850 215 Sewer - School - High SS3
216 Sewer - School - Continuation SS4 496 498 500 503 506 509 217
218
219
220 6. Projected Revenue Requirement, Adjusted for Full Year Implementation 221
222 Projected (1)
223 FY 23/24 FY 24/25 FY 25/26 FY 26/27 FY 27/28
224 Revenue, Existing Rates $26,080,285$26,177,675$26,275,064$26,372,454$26,469,843 225
226 Revenue From Fully Implemented Rate Increases $1,191,000 $2,441,000 $3,752,000 $5,128,000 227 Less Portion Attributable to Fontana Extraterritorial ($78,485) ($160,858) ($247,251) ($337,927) 228
229 Rate Increase Revenues, 6 Months Implementation $593,000 621,000 649,000 679,000 418,000 230 Less Portion Attributable to Fontana Extraterritorial ($39,078) ($40,923) ($42,768) ($44,745) ($27,546) 231
232 Revenue Adjustment for Full Year Implementation $553,922 $580,077 $606,232 $634,255 $390,454 233 Revenue Requirement, Full Year Implementation $27,188,129$28,450,344$29,767,670$31,145,712$32,040,825 234 % Change over Prior Year 4.643% 4.630% 4.629% 2.874% 235
236
237 7. Revenue Requirement by Customer Class
238
239 Projected (1)
240 FY 23/24 FY 24/25 FY 25/26 FY 26/27 FY 27/28
241 Sewer - Residential and Residential Multi $21,292,143$22,280,634$23,312,287$24,391,489$25,092,488 242 Sewer - Residential X 1.3 $112,618 $117,847 $123,303 $129,011 $132,719 243 Sewer - Commercial II $3,225,447 $3,375,189 $3,531,469 $3,694,953 $3,801,144 244 Sewer - Commercial III $633,154 $662,548 $693,226 $725,318 $746,163 245 Sewer - Commercial IV $1,458,156 $1,525,851 $1,596,502 $1,670,409 $1,718,416 246 Sewer - Commercial II X 1.3 $3,125 $3,270 $3,421 $3,580 $3,683 247 Sewer - Commercial IV X 1.3 $42,415 $44,384 $46,439 $48,589 $49,985 248 Sewer - School - Elementary and Continuing $105,244 $110,130 $115,229 $120,563 $124,028 249 Sewer - School - Junior High and High $315,826 $330,489 $345,791 $361,799 $372,197 250 Total $27,188,128$28,450,342$29,767,668$31,145,711$32,040,823 251
252
01082024 Rialto Rate Model Draft
E1WWRateDesign
FG Solutions, LLC
Copyright 2024 All Rights Reservved
Draft
1/7/2024
APPENDIX E: WASTEWATER RATE DESIGN
253 8. Cost of Service Based Rates column width 8 to print jpegs 254
255 Current FY 23/24 FY 24/25 FY 25/26 FY 26/27 FY 27/28 256 Group I, $/month/unit
257 Residential SF and Multi-Family $62.19 $65.58 $68.28 $71.09 $74.01 $75.75 259
260 Non-Residential, $/ccf
261 Group II - Commercial $6.77 $5.35 $5.58 $5.80 $6.04 $6.19 262 Group III - Commercial $7.96 $8.03 $8.36 $8.70 $9.06 $9.27 263 Group IV - Commercial $10.17 $13.66 $14.22 $14.81 $15.42 $15.78 264 Group VI - Commercial $6.77 $5.35 $5.58 $5.80 $6.04 $6.19 265 Commercial II X 1.3 $8.80 $6.96 $7.25 $7.55 $7.86 $8.04 266 Commercial III X 1.3 $10.35 $10.44 $10.87 $11.31 $11.78 $12.06 267 Commercial IV X 1.3 $13.22 $12.72 $13.24 $13.79 $14.35 $14.69 268
269 Schools: $/pupil/month
270 Elementary, Continuing, and Adult Education $0.85 $1.16 $1.21 $1.26 $1.31 $1.34 271 Junior High and High $2.03 $2.47 $2.58 $2.68 $2.79 $2.86 272 Elementary, Continuing, and Adult Education $0.85 $1.12 $1.17 $1.22 $1.27 $1.30 273 Junior High and High $2.03 $2.19 $2.28 $2.37 $2.47 $2.53 274 9. Back-Calculation of Rate Revenues, Cost-of-Service Rates 275
276 Current FY 23/24 FY 24/25 FY 25/26 FY 26/27 FY 27/28 277 Group I, $/month/unit
278 Residential $20,742,493$21,839,505$22,852,177$23,909,893$24,803,267 279 Residential X 1.3 $123,245 $115,641 $120,999 $126,598 $131,323 280
281 Non-Residential, $/ccf
282 Group II - Commercial 3,651,621 3,308,383 3,461,768 3,622,040 3,757,285 283 Group III - Commercial 630,464 649,433 679,542 711,004 737,553 284 Group IV - Commercial 1,271,912 1,495,650 1,564,988 1,637,446 1,698,590 285 Commercial II X 1.3 4,477 4,057 4,246 4,444 4,610
286 Commercial IV X 1.3 43,247 43,507 45,524 47,631 49,409 287 Schools: $/pupil/month
288 Elementary and Continuing 97,165 115,059 120,399 125,980 130,690 289 Junior High and High 287,460 323,945 338,959 354,664 367,903 290 Total $26,852,083$27,895,179$29,188,602$30,539,699$31,680,630 291
292 Compare with Revenue Requirement (Partial Year Implementation)$26,634,206$27,870,265$29,161,436$30,511,456$31,650,368 293 Delta $217,877 $24,914 $27,166 $28,244 $30,261
294
295
296
297 10. Cost-of-Service Adjustments
298
299 10A. COS Adjustments: Residential 1.3X Rates are 1.3X Residential 300 Combined Revenue Requirement, Res and Res 1.3X $21,404,761$22,398,481$23,435,590$24,520,500$25,225,207 301 Weighted Billing Determinants (Res + 1.3x Res1.3X) 27,237 27,374 27,511 27,648 27,788 302 Adjusted Residential Rate $65.49 $68.19 $70.99 $73.91 $75.65 303
304 10B. COS Adjustments: Commercial II 1.3X Rates are 1.3X Commercial IIDe Minimus Change. No Calculation Performed 305
306 10C. COS Adjustments: Commercial IV 1.3X Rates are 1.3X Commercial IV 307 Combined Revenue Requirement, Comm IV and Comm iV 1.3X$1,500,570 $1,570,235 $1,642,941 $1,718,998 $1,768,401 308 Weighted Billing Determinants (CommIV + 1.3x CommIV 1.3X)110,086 110,637 111,190 111,746 112,305 309 Adjusted Commercial IV Rate, $/ccf $13.63 $14.19 $14.78 $15.38 $15.75 310
311
01082024 Rialto Rate Model Draft
E1WWRateDesign
FG Solutions, LLC
Copyright 2024 All Rights Reservved
Draft
1/7/2024
APPENDIX E: WASTEWATER RATE DESIGN
312 10D. COS Adjustments: Gradual Commercial IV Rate Increase With Concurrent Adjustment to Commercial II Rates 313
314 Extra Revenue Collected in Commercial II Rates
315 Proposed Commercial II Rates $6.77 $5.70 $5.80 $5.90 $6.04 $6.19 316 COS Commercial II Rate $5.35 $5.58 $5.80 $6.04 $6.19 317 Billing Determinants 602,333 605,345 608,372 611,414 614,471 318 Additional Revenue $207,851 $135,812 $57,925 $0 $0
319
320 Commercial IV Billing Determinants, ccf/year 106,221 106,752 107,286 107,823 108,362 321
322 Decrease in Commercial IV Rates $1.96 $1.27 $0.54 $0.00 $0.00 323 Proposed Commercial IV Rates $10.17 $11.67 $12.92 $14.24 $15.38 $15.75 324 Commercial IV COS Rates $13.63 $14.19 $14.78 $15.38 $15.75 325 Increase in Commercial IV Rates $1.50 $1.25 $1.32 $1.15 $0.36 326
327 10E. COS Adjustments: Schools - Phase in Rates
328
329 Elementary and Continuing
330 COSA $0.85 $1.16 $1.21 $1.26 $1.31 $1.34
331 Adjusted $0.85 $1.00 $1.10 $1.20 $1.30 $1.34
332 Change In Revenues ($7,766) ($13,075) ($8,136) ($3,340) ($488) 333 $1.12 $1.17 $1.22 $1.27 $1.30to match previously reported 334 Junior High and High
335 COSA $2.03 $2.47 $2.58 $2.68 $2.79 $2.86
336 Adjusted $2.03 $2.20 $2.40 $2.60 $2.75 $2.86to match previously reported 337 Change in Revenues ($17,518) ($28,928) ($16,699) ($8,113) ($2,779) 338 $2.19 $2.28 $2.37 $2.47 $2.53to match previously reported 339 11. Proposed Rates
340
341 Current 3/1/2024 1/1/2025 1/1/2026 1/1/2027 1/1/2028 342 Group I, $/month/unit
343 Residential SF and MF < or = 49 Units $62.19 $65.49 $68.19 $70.99 $73.91 $75.65 344 Residential X 1.3 $80.84 $85.14 $88.65 $92.29 $96.08 $98.35 345
346 Non-Residential, $/ccf
347 Group II - Commercial $6.77 $5.70 $5.80 $5.90 $6.04 $6.19 348 Group III - Commercial $7.96 $8.03 $8.36 $8.70 $9.06 $9.27 349 Group IV - Commercial $10.17 $11.67 $12.92 $14.24 $15.38 $15.75 350 Group VI - Commercial $6.77 $5.70 $5.80 $5.90 $6.04 $6.19 351 Commercial II X 1.3 $8.80 $7.41 $7.54 $7.67 $7.85 $8.05 352 Commercial III X 1.3 $10.35 $10.44 $10.87 $11.31 $11.78 $12.06 353 Commercial IV X 1.3 $13.22 $15.17 $16.80 $18.51 $19.99 $20.48 354 Commercial VI X 1.3 $8.80 $7.41 $7.54 $7.67 $7.85 $8.05 355
356 Schools: $/pupil/month
357 Elementary, Continuing, and Adult Education $0.85 $1.00 $1.10 $1.20 $1.30 $1.34 358 Junior High and High $2.03 $2.20 $2.40 $2.60 $2.75 $2.86 359
396
01082024 Rialto Rate Model Draft
E1WWRateDesign
FG Solutions, LLC
Copyright 2024 All Rights Reservved
Draft
1/7/2024
APPENDIX E: WASTEWATER RATE DESIGN
397 12. Back-Calculation of Rate Revenues, Proposed Rates 398
399 Current FY 23/24 FY 24/25 FY 25/26 FY 26/27 FY 27/28 400 Group I, $/month/unit
401 Residential SF and Multi. $20,728,593$21,810,961$22,821,901$23,878,071$24,769,828 402 Residential X 1.3 $137,429 $144,936 $151,985 $159,361 $165,653 403
404 Non-Residential, $/ccf
405 Group II - Commercial 3,755,546 3,480,734 3,558,976 3,650,142 3,757,490 406 Group III - Commercial 630,534 649,536 679,466 710,880 737,361 407 Group IV - Commercial 1,165,732 1,319,081 1,464,223 1,604,826 1,695,075 408 Commercial II X 1.3 4,604 4,268 4,365 4,478 4,611
409 Commercial IV X 1.3 47,329 53,561 59,459 65,171 68,838 410 Schools: $/pupil/month
411 Elementary and Continuing 89,399 101,984 112,263 122,640 130,202 412 Junior High and High 269,942 295,016 322,260 346,552 365,124 413 Total $26,829,108$27,860,078$29,174,897$30,542,121$31,694,181 414
415 Compare with Revenue Requirement (Partial Year Implementation)$26,634,207$27,870,266$29,161,438$30,511,457$31,650,370 416 Delta $194,901 ($10,189) $13,460 $30,663 $43,811
01082024 Rialto Rate Model Draft
E1WWRateDesign
FG Solutions, LLC
Copyright 2024 All Rights Reservved
Draft
1/7/2024