City of Napa
Annual Water Shortage Assessment
2022
Assessment Period July 2022 through June 2023
For Submission to CA State Department of Water Resources (DWR) by July 1, 2022 ATTACHMENT 1
The 2020 Urban Water Management Plan and corresponding Water Shortage Contingency Plan were adopted by City Council on December 21, 2021. The City of Napa Annual Water Shortage Assessment for the period July 2022 through June 2023 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, 2022 then each year thereafter.
Water Demands. The water demand information in Table 2 representing unconstrained water demands is representative of pre-drought customer demands in 2020.
Water Supplies. The water supply information in Table 3 is representative of the Drought Risk Assessment scenario as previously defined in the Urban Water Management Plan Section 7.2 and includes the known 15% State Water Project allocation for the current water year including Advanced Table A Settlement Water and participation in the State Water Project dry year transfer programs. Usage of Lake Hennessey is optimized based on actual replenishment that occurred during winter 2021-22. Use of Lake Hennessey is minimized during the months of October and November due to seasonal taste and odor challenges due to lake turnover. Also of note is that the Milliken Reservoir supply is only available during the summer months due to seasonal water treatment limitations.
As required by Executive Order N-7-22, actions to reduce demands by 20 percent are to be implemented. Since July 2021, the City of Napa declared a moderate water shortage emergency and is effectively ahead of the prescribed Level 2 water shortage actions. Table 5 is a list of categories of actions that are actions the City has been and/or will continue to implement in response to the planned water shortage through June 2023.
ATTACHMENT 1
Table 1. Annual Assessment Information
Annual Assessment Information (Required)
Year Covered By This Shortage Report
Start: July 1, 2022
End: June 30, 2023
Supplier's Annual Assessment Planning Cycle
Start Month: JULY
End Month: JUNE
Data Reporting Interval Used: MONTHLY
Volume Unit for Reported Supply and Demand:
(Must use the same unit throughout) AF
Water Supplier's Contact Information
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:
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 (Optional)
Activity Timeline/ Outcomes / Links / Notes
Annual Assessment/ Shortage Report Title: Optional
Annual Assessment / Shortage Report Approval Date: 6/21/2022 Other Annual Assessment Related Activities: Optional
(Add rows as needed)
ATTACHMENT 1
Use Type Start Year: 2022 Volumetric Unit Used2: AF Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Total by Water Demand Type
All Demands Unconstrained 1607 1640 1488 1408 985 809 694 722 826 1149 1443 1440 14211 0 0
0 0
0 0
0 0
0 1607 1640 1488 1408 985 809 694 722 826 1149 1443 1440 14211 0 0
0 0
0 000000000000 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 using previous fiscal year FY21 ( before drought restrictions imposed) and include volumes delivered to St. Helena.
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
ATTACHMENT 1
Water Supply Start Year: 2022 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 200 250 250 0 0 960 920 680 1020 1020 1020 1020 7340 Supply from Storage Milliken Reservoir 200 200 200 100 0000005 0 1 0 0 8 5 0 Purchased/Imported Water State Water Project 950 930 810 1080 920 180 660 710 50 500 500 500 7790 0 0
0 0
0 0
0 1350 1380 1260 1180 920 1140 1580 1390 1070 1520 1570 1620 15980 0 0 0
0 0
0 000000000000 0 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
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: Supplies reflect Drought Risk Assessment scenario in Urban Water Management Plan Section 7.2, including 15% State Water Project allocation for 2023, with Lake Hennessey usage optimized based on actual winter 2021‐22 replenishment. Milliken Reservoir supply is considered unavailable during winter months due to treatment limitations. State Water Project supplies include Advanced Table A.
Total by Month (Potable)
Total by Month (Non‐Potable)
ATTACHMENT 1
Table 4(P): Potable Water Shortage Assessment1
Start Year: 2022 Volumetric Unit Used2: AF
Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun3 Total
Anticipated Unconstrained Demand 1607.0 1640.0 1488.0 1408.0 985.0 809.0 694.0 722.0 826.0 1149.0 1443.0 1440.0 14211.0 0 Anticipated Total Water Supply 1350.0 1380.0 1260.0 1180.0 920.0 1140.0 1580.0 1390.0 1070.0 1520.0 1570.0 1620.0 15980.0 0 Surplus/Shortage w/o WSCP Action ‐257.0 ‐260.0 ‐228.0 ‐228.0 ‐65.0 331.0 886.0 668.0 244.0 371.0 127.0 180.0 1,769. 0 % Surplus/Shortage w/o WSCP Action ‐16% ‐16% ‐15% ‐16% ‐7% 41% 128% 93% 30% 32% 9% 13% 12% State Standard Shortage Level 2222100000000
Benefit from WSCP: Supply Augmentation 60.0 70.0 130.0 Benefit from WSCP: Demand Reduction 320.0 328.0 298.0 280.0 100.0 80.0 70.0 70.0 165.0 230.0 290.0 290.0 2521.0 Revised Surplus/Shortage with WSCP 63.0 68.0 70.0 112.0 105.0 411.0 956.0 738.0 409.0 601.0 417.0 470.0 4420.0 % Revised Surplus/Shortage with WSCP 4% 4% 5% 8% 11% 51% 138% 102% 50% 52% 29% 33% 31% Planned WSCP Actions
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.
ATTACHMENT 1
July 1, 2022 to June 30, 2023
Enter Amount
(Drop‐down
List)
Select % or
Volume Unit
Start Month End Month
1 Expand Public Information Campaign Yes 5 % July June
1 Offer Water Use Surveys Yes 2 % July June
1 Provide Rebates for Turf Replacement Yes 2 % July June 2 Landscape ‐ Limit landscape irrigation to
specific times Yes 2 % July June
2 Landscape ‐ Restrict or prohibit runoff
from landscape irrigation Yes 2 % July June
2 Other ‐ Require automatic shut of hoses Yes 1 % July June 2 Other water feature or swimming pool
restriction Yes 1 % July June
2 Other ‐ Prohibit use of potable water for
washing hard surfaces Yes 1 % July June
2 CII ‐ Restaurants may only serve water
upon request Yes 1 % July June
2 CII ‐ Lodging establishment must offer
opt out of linen service Yes 1 % July June
3 Landscape ‐ Limit landscape irrigation to
specific days Yes 10 % July June
3 Increase Water Waste Patrols Yes 5 % July June
3 Transfers No 2 % October Novembe r
Table 5: Planned Water Shortage Response Actions
NOTES:
Add additional rows as needed
How much is action going to
reduce the shortage gap?
When is shortage response
action anticipated to be
implemented?Is action
already being
implemented?
(Y/N)
ACTIONS: 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
ATTACHMENT 1