Chatham County Southwest Water System

The Division of Water Resources (DWR) provides the data contained within this Local Water Supply Plan (LWSP) as a courtesy and service to our customers. DWR staff does not field verify data. Neither DWR, nor any other party involved in the preparation of this LWSP attests that the data is completely free of errors and omissions. Furthermore, data users are cautioned that LWSPs labeled PROVISIONAL have yet to be reviewed by DWR staff. Subsequent review may result in significant revision. Questions regarding the accuracy or limitations of usage of this data should be directed to the water system and/or DWR.

1. System Information

Contact Information

Complete

Water System Name: Chatham County Southwest Water System   PWSID: 03-19-050
Mailing Address:Post Office Box 910
Pittsboro, NC 27312		Ownership:County
 
Contact Person:Blake MillsTitle:Public Utilities Director
Phone:919-542-8238Cell/Mobile:919-548-4847
Distribution System
Line Type Size Range (Inches) Estimated % of lines
Ductile Iron 6-16 25.00 %
Polyvinyl Chloride 2-10 75.00 %
What are the estimated total miles of distribution system lines?   115 Miles
How many feet of distribution lines were replaced during 2024?   0 Feet
How many feet of new water mains were added during 2024?   0 Feet
How many meters were replaced in 2024?   57
How old are the oldest meters in this system?   20 Year(s)
How many meters for outdoor water use, such as irrigation, are not billed for sewer services?   0
What is this system's finished water storage capacity?   0.9500 Million Gallons
Has water pressure been inadequate in any part of the system since last update? Line breaks that were repaired quickly should not be included.   Yes
Programs
Does this system have a program to work or flush hydrants?   Yes, As Needed
Does this system have a valve exercise program?   Yes, As Needed
Does this system have a cross-connection program?   Yes
Does this system have a program to replace meters?   Yes
Does this system have a plumbing retrofit program?   No
Does this system have an active water conservation public education program?   Yes
Does this system have a leak detection program?   Yes
Water Conservation
What type of rate structure is used?   Increasing Block
How much reclaimed water does this system use?   0.0000 MGD   For how many connections?   0
Does this system have an interconnection with another system capable of providing water in an emergency?   Yes

2. Water Use Information

Service Area
Sub-Basin(s)% of Service Population
Deep River (02-2)100 %
County(s)% of Service Population
Chatham100 %
What was the year-round population served in 2024?   2,503
Has this system acquired another system since last report?   No
Water Use by Type
Type of Use Metered
Connections		 Metered
Average Use (MGD)		 Non-Metered
Connections		 Non-Metered
Estimated Use (MGD)
Residential 1,001 0.1021 0 0.0000
Commercial 83 0.0239 0 0.0000
Industrial 62 0.0791 0 0.0000
Institutional 0 0.0000 0 0.0000

How much water was used for system processes (backwash, line cleaning, flushing, etc.)?   0.0553 MGD

Water Sales
Purchaser PWSID Average
Daily Sold
(MGD)		 Days
Used		 Contract Required to
comply with water
use restrictions?		 Pipe Size(s)
(Inches)		 Use
Type
MGD Expiration Recurring
Moore County - High Falls 50-63-021 0.0235 365 0.0250 2026 Yes Yes 6 Regular
Town of Siler City 03-19-010 0.0190 366 1.0000 2029 Yes Yes 12 Regular

3. Water Supply Sources

Monthly Withdrawals & Purchases
Average Daily
Use (MGD)		 Max Day
Use (MGD)		 Average Daily
Use (MGD)		 Max Day
Use (MGD)		 Average Daily
Use (MGD)		 Max Day
Use (MGD)
Jan 0.3000 May 0.3316 Sep 0.3835
Feb 0.2582 Jun 0.3645 Oct 0.3283
Mar 0.3375 Jul 0.2787 Nov 0.3481
Apr 0.3634 Aug 0.3799 Dec 0.3595

Water Purchases From Other Systems
Seller PWSID Average
Daily Purchased
(MGD)		 Days
Used		 Contract Required to
comply with water
use restrictions?		 Pipe Size(s)
(Inches)		 Use
Type
MGD Expiration Recurring
Chatham County Asbury Water System 40-19-010 0.2776 365 0.4000 Yes Yes 16 Regular
Goldston-Gulf Sanitary District 03-19-025 0.0000 0 0.2500 Yes Yes 10 Emergency
Town of Siler City 03-19-010 0.0588 365 0.0700 2029 Yes Yes 8 &12 Regular

4. Wastewater Information

Monthly Discharges
Average Daily
Discharge (MGD)		 Average Daily
Discharge (MGD)		 Average Daily
Discharge (MGD)
Jan 0.0000 May 0.0000 Sep 0.0000
Feb 0.0000 Jun 0.0000 Oct 0.0000
Mar 0.0000 Jul 0.0000 Nov 0.0000
Apr 0.0000 Aug 0.0000 Dec 0.0000

How many sewer connections does this system have?   0
How many water service connections with septic systems does this system have?   1,146
Are there plans to build or expand wastewater treatment facilities in the next 10 years?   No

5. Planning

Projections
  2024 2030 2040 2050 2060 2070
Year-Round Population 2,503 2,657 2,935 3,242 3,581 3,956
Seasonal Population 0 0 0 0 0 0
 
Residential 0.1021 0.0964 0.1065 0.1176 0.1299 0.1435
Commercial 0.0239 0.0254 0.0281 0.0310 0.0343 0.0379
Industrial 0.0791 0.0840 0.0928 0.1025 0.1132 0.1251
Institutional 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
System Process 0.0553 0.0587 0.0648 0.0716 0.0791 0.0874
Unaccounted-for 0.0327 0.1927 0.1968 0.2013 0.2064 0.2121

Growth projections were calculated based on a traditional 1% growth.

Future Supply Sources
Source Name PWSID Source Type Additional Supply Year Online Year Offline Type
Chatham County Asbury 40-19-010 Purchase 1.7000 2030 Regular

The Southwest Water System needs to purchase an additional 1.7 MGD from the Asbury Water System to account for up to 1 MGD that the Southwest Water System sells to the Siler City Water System. Asbury Water System needs to purchase 1.75 MGD from the North Water System to achieve this.

Demand v/s Percent of Supply
  2024 2030 2040 2050 2060 2070
Surface Water Supply 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Ground Water Supply 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Purchases 0.4700 0.4700 0.4700 0.4700 0.4700 0.4700
Future Supplies 1.7000 1.7000 1.7000 1.7000 1.7000
Total Available Supply (MGD) 0.4700 2.1700 2.1700 2.1700 2.1700 2.1700
Service Area Demand 0.2931 0.4572 0.4890 0.5240 0.5629 0.6060
Sales 0.0424 1.0250 1.0250 1.0250 1.0250 1.0250
Future Sales 0.0000 0.0000 0.0000 0.0000 0.0000
Total Demand (MGD) 0.3355 1.4822 1.5140 1.5490 1.5879 1.6310
Demand as Percent of Supply 71% 68% 70% 71% 73% 75%

The purpose of the above chart is to show a general indication of how the long-term per capita water demand changes over time. The per capita water demand may actually be different than indicated due to seasonal populations and the accuracy of data submitted. Water systems that have calculated long-term per capita water demand based on a methodology that produces different results may submit their information in the notes field.

Your long-term water demand is 41 gallons per capita per day. What demand management practices do you plan to implement to reduce the per capita water demand (i.e. conduct regular water audits, implement a plumbing retrofit program, employ practices such as rainwater harvesting or reclaimed water)? If these practices are covered elsewhere in your plan, indicate where the practices are discussed here.    Water leakage studies on conducted on a as needed basis.

Are there other demand management practices you will implement to reduce your future supply needs?   Education materials in water bills and on website to promote water conservation.

What supplies other than the ones listed in future supplies are being considered to meet your future supply needs?   No other water supplies are needed. Chatham County has a 13 MGD allocation from Jordan Lake (currently using only 3 MGD) and can produced treated water to meet future needs through a combination of our own Beaver Creek WTP and the Regional Western Intake WTP that is expected to be operational in 2031.

How does the water system intend to implement the demand management and supply planning components above?   Chatham County has budgeted for the new Regional Western Intake WTP in our CIP and for Expansion of the Beaver Creek WTP in our CIP.

Additional Information

Has this system participated in regional water supply or water use planning?  Yes, Chatham County is constructing a regional water treatment plant and raw water intake on Jordan Lake with the Western Intake Partners (City of Durham, Pittsboro and OWASA). The new regional Western Intake Partners (WIP) WTP is planned to be operational in 2031. Chatham County is participating in a Triangle Regional Water Supply Plan to year 2070, this is sponsored by Central Pines Regional Council.

What major water supply reports or studies were used for planning?  Chatham County Master Plan for the North, Asbury and Southwest Water Systems - determines long-term growth, water service areas, water demands and transmission line capacities, by Freese Nichols. Triangle Water Partners Triangle Regional Water Supply Plan prepared by HDR and Hazen.

Please describe any other needs or issues regarding your water supply sources, any water system deficiencies or needed improvements (storage, treatment, etc.) or your ability to meet present and future water needs. Include both quantity and quality considerations, as well as financial, technical, managerial, permitting, and compliance issues:   Chatham County is merging the North, Asbury and Southwest Water Systems with Sanford/TriRiver Water effective July 1, 2025.

The Division of Water Resources (DWR) provides the data contained within this Local Water Supply Plan (LWSP) as a courtesy and service to our customers. DWR staff does not field verify data. Neither DWR, nor any other party involved in the preparation of this LWSP attests that the data is completely free of errors and omissions. Furthermore, data users are cautioned that LWSPs labeled PROVISIONAL have yet to be reviewed by DWR staff. Subsequent review may result in significant revision. Questions regarding the accuracy or limitations of usage of this data should be directed to the water system and/or DWR.