7824 Mukilteo Speedway
Mukilteo, WA 98275
425-355-3355

Westside Wastewater Service Rates


Customers West of Paine Field, per Resolution No. 408-16 (approved: 12/21/16)

Effective 01/01/17

Effective 01/01/18

Customer Classification* 2-Month Base Rate Volume Charge ($/k gal) 2-Month Base Rate Volume Charge ($/k gal)
Single Family Residence1
$ 130.48
N/A
$ 132.70
N/A
Multi-family residence2
$ 91.72
N/A
$ 92.62
N/A
Commercial Class I3:
5/8 x 3/4-inch meter
$77.08
$ 7.10
$76.92
$ 7.32
1-inch meter
$192.66
$ 7.10
$192.28
$ 7.32
1 1/2-inch meter
$ 385.36
$ 7.10
$ 384.58
$ 7.32
2-inch meter
$ 616.56
$ 7.10
$ 615.30
$ 7.32
3-inch meter
$ 1,233.56
$ 7.10
$1,231.04
$ 7.32
4-inch meter
$ 1,926.74
$ 7.10
$1,922.82
$ 7.32
Strength Class Volume Charge:
Class II4
$ 3.47
$3.58
Class III4
$ 8.34
$8.59
Class IV 5

$ 0.83

$ .86

Commercial (Contract)
$26,752.10
$ 4.34
$27,554.68
$4.47

Surcharge: Additionally, all customers in the Commercial-Industrial class above shall also be charged an additional surcharge based on strength of waste. Strength classes shall be measured as follows:

Strength Classes

BOD5 Units
(Actual Water Use)
Strength Class I 0 to 300 mg/L BOD5 200 mg/L BOD5
Strength Class II 301 to 900 mg/L BOD5 400 mg/L BOD5
Strength Class III 901 to 1,500 mg/L BOD5 1,000 mg/L BOD5
Strength Class IV Over 1,500 mg/L BOD5 To be determined (TBD)

Wastewater surcharge rates for Strength Class IV are based on BOD5 concentrations as opposed to predefined concentrations used in Classes I, II and III. Staff, based on a calculation for BOD5 over 1,500 mg/L BOD5, will determine actual volume rate.

*Customer classifications are established as follows:

  1. Single family residential shall mean a residential unit served by a separate water meter.
  2. Multi-family residential shall mean duplex, apartments, condominiums, townhouses, and mobile home parks served by a single water meter.
  3. Commercial-Industrial Class I shall mean a non-residential non-food processing/preparation customers including but not limited to retail stores, offices, service stations, schools, churches, governmental facilities, parks, manufacturing businesses, hotels and motels, all of which have a daily average BOD strength of 300 mg/L or less.
  4. Commercial-Industrial Class II and III shall mean a non-residential customer including restaurants, taverns, food processing/preparation businesses, breweries, ferry terminals and ferry waste, or other businesses which have a daily BOD strength between 301mg/L and 1,500 mg/L.
  5. Commercial-Industrial Class IV shall mean a non-residential customer with a daily average BOD strength in excess of 1,500 mg/L.
  6. Commercial-Industrial Contract Customers shall mean a non-residential customer served by the District by contract.

Service Rate Areas


Service Area Map

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