How to Calculate Your Bill under the Proposed Water Rates: 

  1. Determine your Account Type (Customer Class), Location (Inside or Outside City limits), and Service Size.
  2. Find the Bimonthly Fixed Service Charge for your Service Size in the 12/1/17 column of that rate table (or the Fire Services table if applicable).
    • All Proposed Water Rate Tables are displayed at the bottom of this page and in the mailed Notice.
  3. Estimate the Units (1,000 gallons) of water that your account uses bimonthly (in two months).
  4. Calculate your Water Quantity Charge by multiplying your Units by the applicable Cost Per Unit in the 12/1/17 column for your Customer Class and Location (Inside or Outside City).
    • For Single-Family Residential accounts:  Multiply each Tier of Units by its Cost Per Unit and sum those results to get your total Water Quantity Charge.
  5. If your account is in a Pumped Zone, calculate your Elevation Surcharge by multiplying your Units by $1.84.
    • Applicability of this Surcharge may be found on your most recent bill and in our Water Account Details list sorted by Service Address.
  6. Add your Bimonthly Fixed Service Charge, Water Quantity Charge, and Elevation Surcharge (if applicable) to calculate your total Bimonthly Bill.
    • Subtract $25 if you are a single-family residential customer enrolled in the RateShare Program.
    • Fire Services pay the Bimonthly Fire Service Charge only.  They have no Water Quantity Charge or other charges.

To estimate bills for later years, use the appropriate column in the rate tables (e.g., 10/1/21) instead of 12/1/17.

NOTE: The City of Napa bills water customers bimonthly (every two months).  To estimate your monthly water costs to compare with other utilities, simply divide your total Bimonthly Bill in half.

 

SAMPLE BILL CALCULATIONS:

SINGLE-FAMILY RESIDENTIAL - INSIDE CITY - 1-INCH SERVICE
BIMONTHLY USAGE = 3 UNITS

Bimonthly Fixed Service Charge = $28.59
Water Quantity Charge = 3 Units x $4.07 = $12.21

Bimonthly Bill = $28.59 + $12.21 = $40.80

 

SINGLE-FAMILY RESIDENTIAL - INSIDE CITY - 3/4-INCH SERVICE
BIMONTHLY USAGE = 16 UNITS

Bimonthly Fixed Service Charge = $28.59
Water Quantity Charge = (14 Units x $4.07) + (2 Units x $5.94) = $68.86

Bimonthly Bill = $28.59 + $68.86 = $97.45

 

SINGLE-FAMILY RESIDENTIAL - OUTSIDE CITY - 3/4-INCH SERVICE - PUMPED ZONE
BIMONTHLY USAGE = 43 UNITS

Bimonthly Fixed Service Charge = $28.59
Water Quantity Charge = (14 Units x $5.87) + (13 Units x $8.41) + (16 Units x $10.93) = $366.39
Elevation Surcharge = 43 Units x $1.84 = $79.12

Bimonthly Bill = $28.59 + $366.39 + $79.12 = $474.10

 

MULTI-FAMILY RESIDENTIAL - INSIDE CITY - 2-INCH SERVICE
BIMONTHLY USAGE = 104 UNITS

Bimonthly Fixed Service Charge = $84.78
Water Quantity Charge = 104 Units x $5.75 = $598.00

Bimonthly Bill = $84.78 + $598.00 = $682.78

 

COMMERCIAL - INSIDE CITY - 4-INCH SERVICE
BIMONTHLY USAGE = 91 UNITS

Bimonthly Fixed Service Charge = $258.45
Water Quantity Charge = 91 Units x $5.85 = $532.35

Bimonthly Bill = $258.45 + $532.35 = $790.80

 

IRRIGATION - OUTSIDE CITY - 1 1/2-INCH SERVICE - PUMPED ZONE
BIMONTHLY USAGE = 331 UNITS

Bimonthly Fixed Service Charge = $54.13
Water Quantity Charge = 331 Units x $9.21 = $3,048.51
Elevation Surcharge = 331 Units x $1.84 = $609.04

Bimonthly Bill = $54.13 + $3,048.51 + $609.04 = $3,711.68

 

FIRE SERVICE - 8-INCH SERVICE

Bimonthly Fire Service Charge = $347.65

 

PROPOSED WATER RATES:

BIMONTHLY FIXED SERVICE CHARGE

ALL CUSTOMER CLASSES, INSIDE/OUTSIDE CITY
Service Size 12/1/17 10/1/18 10/1/19 10/1/20 10/1/21
 3/4-inch or 1-inch $28.59 $33.02 $38.16 $42.95 $48.58
1 1/2-inch $54.13 $63.00 $72.89 $82.40 $93.43
2-inch $84.78 $98.99 $114.58 $129.74 $147.24
3-inch $166.51 $194.96 $225.73 $255.97 $290.75
4-inch $258.45 $302.92 $350.78 $397.98 $452.19
6-inch $513.84 $602.81 $698.14 $792.46 $900.65
8-inch $820.32 $962.68 $1,114.97 $1,265.83 $1,438.79

 

WATER QUANTITY CHARGE
(1 Billing Unit = 1,000 gallons)

SINGLE-FAMILY RESIDENTIAL
INSIDE CITY
Cost Per Unit (1,000 gallons)
Tier 12/1/17 10/1/18 10/1/19 10/1/20 10/1/21
0-14 Units $4.07 $4.23 $4.34 $4.46 $4.57
15-27 Units $5.94 $6.12 $6.27 $6.43 $6.58
28+ Units $7.68 $7.95 $8.20 $8.46 $8.70

 

SINGLE-FAMILY RESIDENTIAL
OUTSIDE CITY
Cost Per Unit (1,000 gallons)
Tier 12/1/17 10/1/18 10/1/19 10/1/20 10/1/21
0-14 Units $5.87 $6.08 $6.21 $6.38 $6.53
15-27 Units $8.41 $8.71 $9.00 $9.30 $9.58
28+ Units $10.93 $11.04 $11.61 $11.95 $12.39

 

MULTI-FAMILY RESIDENTIAL
Cost Per Unit (1,000 gallons)
Location 12/1/17 10/1/18 10/1/19 10/1/20 10/1/21
INSIDE CITY $5.75 $5.99 $6.16 $6.35 $6.53
OUTSIDE CITY $8.85 $9.19 $9.56 $9.91 $10.26

 

COMMERCIAL
Cost Per Unit (1,000 gallons)
Location 12/1/17 10/1/18 10/1/19 10/1/20 10/1/21
INSIDE CITY $5.85 $6.11 $6.27 $6.47 $6.64
OUTSIDE CITY $8.96 $9.33 $9.69 $10.04 $10.40

 

IRRIGATION
Cost Per Unit (1,000 gallons)
Location 12/1/17 10/1/18 10/1/19 10/1/20 10/1/21
INSIDE CITY $6.02 $6.30 $6.46 $6.66 $6.84
OUTSIDE CITY $9.21 $9.60 $9.97 $10.34 $10.70

 

ELEVATION SURCHARGE

ELEVATION SURCHARGE for Pumped Zone Customers
Cost Per Unit (1,000 gallons)
12/1/17 10/1/18 10/1/19 10/1/20 10/1/21
$1.84 $1.84 $1.93 $1.98 $2.08

  

RATESHARE DISCOUNT*

RATESHARE for Eligible Low-Income Customers*
Discount Per Bimonthly Bill
Current Starting 12/1/17
$4.75 $25.00

 

FIRE SERVICES

BIMONTHLY FIRE SERVICE CHARGE
Service Size 12/1/17 10/1/18 10/1/19 10/1/20 10/1/21
1 1/2-inch $24.59 $27.07 $29.11 $31.36 $33.75
2-inch $37.51 $41.50 $44.52 $48.07 $51.76
2 1/2-inch $54.77 $60.76 $65.10 $70.38 $75.80
3-inch $71.97 $79.97 $85.62 $92.64 $99.79
4-inch $110.74 $123.26 $131.86 $142.77 $153.81
6-inch $218.43 $243.49 $260.30 $282.04 $303.89
8-inch $347.65 $387.77 $414.44 $449.16 $483.99
10-inch $498.41 $556.09 $594.26 $644.14 $694.10
12-inch $929.15 $1,037.02 $1,108.03 $1,201.21 $1,294.42