City of Napa
Annual Water Shortage Assessment
2023
Assessment Period July 2023 through June 2024
For Submission to CA State Department of Water Resources (DWR) by July 1, 2023
ATTACHMENT 1
The City of Napa Annual Water Shortage Assessment for the period July 2023 through June 2024 is defined in the following tables as required by the California State Department of Water Resources. This assessment of annual demands and water supplies is required to be submitted by July 1, 2023, and each year thereafter.
Water Demands. The water demand information in Table 2 represents baseline water demands inclusive of the permanent water waste regulations listed in Table 5. Demands reflect a modest post-drought increase from 2022-23 and are unconstrained by actions taken with a water shortage declaration.
Water Supplies. The water supply information in Table 3 reflects an improved scenario for both local and imported sources. With the calendar year 2023 State Water Project allocation at 100%, sufficient carryover supply will be available in 2024. Use of Lake Hennessey is minimized during the months of October and November due to seasonal taste and odor challenges due to lake turnover. State Water is limited during March due to North Bay Aqueduct maintenance. Also of note is that the Milliken Reservoir supply is only available during the summer months due to seasonal water treatment limitations.
With the bountiful winter of 2022-23, the City of Napa declared an end to its moderate water shortage emergency in April 2023. However, in May 2023 the City adopted permanent water waste regulations that remain in effect even when no water shortage is declared. Table 5 is a list of actions that the City has been and/or will continue to implement.
ATTACHMENT 1
Table 1. Annual Assessment Information
Annual Assessment Information
Year Covered By This Shortage Report (Required)
Start: July 1, 2023
End: June 30, 2024
Volume Unit for Reported Supply and Demand:
(Must use the same unit throughout) AF
Supplier's Annual Assessment Planning Cycle (Required) Start Month: JULY
End Month: JUNE
Data Interval: Monthly (12 data points per year)
Water Supplier's Contact Information (Required)
Water Supplier's Name: City of Napa
Contact Name: Patrick Costello
Contact Title: Water Resources Analyst
Street Address: 1700 Second Street, Suite 100
ZIP Code: 94559
Phone Number: (707)257-9309
Email Address: [email protected]
Report Preparer's Contact Information
(if different from above)
Preparer's Organization Name:
Preparer's Contact Name:
Phone Number: (XXX)XXX-XXXX
Email Address:
Supplier's Water Shortage Contingency Plan
WSCP Title City of Napa Water Shortage Contingency Plan WSCP Adoption Date 12/21/2021
Other Annual Assessment Related Activities
Activity Timeline/ Outcomes / Links / Notes
Annual Assessment/ Shortage Report Title: Optional
Annual Assessment / Shortage Report Approval Date: 6/20/2023 Other Annual Assessment Related Activities: Optional
(Add rows as needed)
ATTACHMENT 1
= From prior tables
= Auto calculated
Use Type Start Year: 2023 Volumetric Unit Used2: AF Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Total by Water Demand Type
All Demands 1400 1400 1260 1170 900 780 750 690 775 930 1200 1365 12620 0 0
0 0
0 0
0 0
0 1400 1400 1260 1170 900 780 750 690 775 930 1200 1365 12620 0 0
0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0
Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Total
0 0
0 0
Table 2: Water Demands1
Projected Water Demands - Volume3
Total by Month (Non-Potable)
1Projections are based on best available data at time of submitting the report and actual demand volumes could be different due to many factors. 2Units of measure (AF, CCF, MG) must remain consistent. 3When opting to provide other than monthly volumes (bi-monthly, quarterly, or annual), please see directions on entering data for Projected Water Demand in the Table Instructions.
Notes: Monthly demands are estimated at 5% above previous 2022-23 and include voumes delivered to St. Helena. They are unconstrained by actions taken during a declared water shortage.
Total by Month (Potable)
Additional
Description
(as needed)
Level of
Treatment
for Non-
Potable
Supplies
Drop-down
list
Drop-down list
May select each use multiple times
These are the only Use Types that will
be recognized by the WUEdata online
submittal tool
(Add additional rows as needed)
Demands Served by Potable Supplies
Demands Served by Non-Potable Supplies
Three years ago total demand
Four years ago total demand
Optional (for comparison purposes)
Last year's total demand
Two years ago total demand
ATTACHMENT 1
= From prior tables
= Auto calculated
Water Supply Start Year: 2023 Volumetric Unit Used2: AF Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun
Total by
Water
Supply Type
Supply from Storage Lake Hennessey 700 750 700 50 50 100 100 100 1000 300 700 700 5250 Supply from Storage Milliken Reservoir 150 200 200 100 0 0 0 0 0 0 0 100 750 Purchased/Imported Water State Water Project 1050 1100 1000 1100 950 750 800 660 100 850 950 970 10280 0 0
0 0
0 0
0 1900 2050 1900 1250 1000 850 900 760 1100 1150 1650 1770 16280 0 0 0
0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Total
0 Table 3: Water Supplies1
Projected Water Supplies - Volume3
Water
Quality
Drop-down
List
Total Right
or Safe
Yield*
(optional)
Additional Detail on
Water Supply
Drop-down List
May use each category multiple
times.These are the only water
supply categories that will be
recognized by the WUEdata online
submittal tool
(Add additional rows as needed)
Potable Supplies
Non-Potable Supplies
eAR Reported Total Water Supplies
Optional (for comparison purposes)
1Projections are based on best available data at time of submitting the report and actual supply volumes could be different due to many factors. 2Units of measure (AF, CCF, MG) must remain consistent. 3When opting to provide other than monthly volumes (bi-monthly, quarterly, or annual), please see directions on entering data for Projected Water Supplies in the Table Instructions.
Notes: Lake Hennessey supplies reflect nearly full reservoir in spring 2023. Milliken Reservoir is considered unavailable during winter months due to treatment limitations. State Water Project supplies reflect 2023 100% Table A allocation and 2024 carryover water availability.
Total by Month (Potable)
Total by Month (Non-Potable)
ATTACHMENT 1
= Auto calculated
= For manual input
Table 4(P): Potable Water Shortage Assessment1
Start Year: 2023 Volumetric Unit Used2: AF
Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun3 Total
Anticipated Unconstrained Demand 1400.0 1400.0 1260.0 1170.0 900.0 780.0 750.0 690.0 775.0 930.0 1200.0 1365.0 12620.00 Anticipated Total Water Supply 1900.0 2050.0 1900.0 1250.0 1000.0 850.0 900.0 760.0 1100.0 1150.0 1650.0 1770.0 16280.00 Surplus/Shortage w/o WSCP Action 500.0 650.0 640.0 80.0 100.0 70.0 150.0 70.0 325.0 220.0 450.0 405.0 3,660.0 % Surplus/Shortage w/o WSCP Action 36% 46% 51% 7% 11% 9% 20% 10% 42% 24% 38% 30% 29% State Standard Shortage Level 0 0 0 0 0 0 0 0 0 0 0 0 0 Benefit from WSCP: Supply Augmentation 0.0
Benefit from WSCP: Demand Reduction 0.0
Revised Surplus/Shortage with WSCP 500.0 650.0 640.0 80.0 100.0 70.0 150.0 70.0 325.0 220.0 450.0 405.0 3660.0 % Revised Surplus/Shortage with WSCP 36% 46% 51% 7% 11% 9% 20% 10% 42% 24% 38% 30% 29% = Auto calculated
= For manual input
Table 4(NP): Non-Potable Water Shortage Assessment1
Start Year: 2023 Volumetric Unit Used2: AF
Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun3 Total
Anticipated Unconstrained Demand: Non-Potable 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.00 Anticipated Total Water Supply: Non-Potable 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Surplus/Shortage w/o WSCP Action: Non-Potable 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 % Surplus/Shortage w/o WSCP Action: Non-Potable
Benefit from WSCP: Supply Augmentation 0.0
Benefit from WSCP: Demand Reduction 0.0
Revised Surplus/Shortage with WSCP 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 % Revised Surplus/Shortage with WSCP
1Assessments are based on best available data at time of submitting the report and actual volumes could be different due to many factors. 2Units of measure (AF, CCF, MG) must remain consistent. 3When optional monthly volumes aren't provided, verify Tables 2 and 3 use the same columns for data entry and are reflected properly in Table 4 and make sure to use those same columns to enter the benefits from Planned WSCP Actions. Please see directions on the shortage balancing exercise in the Table Instructions. If a shortage is projected, the supplier is highly recommended to perform a monthly analysis to more accurately identify the time of shortage. 4If you enter any WSCP Benefits, then you must enter the corresponding planned Actions into Table 5. = From prior tables
Planned WSCP Actions4
1Assessments are based on best available data at time of submitting the report and actual volumes could be different due to many factors. 2Units of measure (AF, CCF, MG) must remain consistent. 3When optional monthly volumes aren't provided, verify Tables 2 and 3 use the same columns for data entry and are reflected properly in Table 4 and make sure to use those same columns to enter the benefits from Planned WSCP Actions. Please see directions on the shortage balancing exercise in the Table Instructions. If a shortage is projected, the supplier is highly recommended to perform a monthly analysis to more accurately identify the time of shortage. 4If you enter any WSCP Benefits, then you must enter the corresponding planned Actions into Table 5. = From prior tables
Planned WSCP Actions4
ATTACHMENT 1
July 1, 2023 to June 30, 2024
Enter Amount
(Drop-down
List)
Select % or
Volume Unit
Start Month End Month
0 (No Shortage) Offer Water Use Surveys Yes July June
0 (No Shortage) Landscape - Restrict or prohibit runoff from landscape irrigation Yes July June
0 (No Shortage) Landscape - Limit landscape irrigation to specific times Yes July June
0 (No Shortage)
Other - Customers must repair leaks,
breaks, and malfunctions in a timely
manner
Yes July June
0 (No Shortage) Other - Prohibit use of potable water for washing hard surfaces Yes July June
0 (No Shortage) Other - Require automatic shut of hoses Yes July June 0 (No Shortage) Provide Rebates for Turf Replacement Yes July June NOTES:
Notes Section to be used only
for clarifying details, and not
for listing specific actions.
Actions must be entred into
table rows above.
1If you plan Supply Augmentation Actions then you must enter WSCP Benefits from Supply Augmentation Actions into Table 4. If you plan Demand Reduction Actions then you must enter WSCP Benefits from Demand Reduction Actions into Table 4. 2If an Action is planned to be implemented in multiple non-contiguous periods of the year, please make separate entries on multiple rows for the same action spanning the different implementation periods.
Table 5: Planned Water Shortage Response Actions
Add additional rows as needed
How much is action going to
reduce the shortage gap?
(Optional)
When is shortage response
action anticipated to be
implemented2?Is action
already being
implemented?
(Y/N)
ACTIONS1: Demand Reduction, Supply
Augmentation, and Other Actions.
(Drop-down List)
These are the only categories that will be
accepted by the WUEdata online submittal
tool. Select those that apply.
Anticipated Shortage
Level
Drop-down List of
State Standard Levels (1 -
6) and Level 0 (No
Shortage)
Demand Reduction Actions listed above are permanent water waste regulations for the City of Napa. They remain in effect even when no shortage is declared.
ATTACHMENT 1