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

Provisional

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:Jason BertoncinoTitle:Director of Engineering
Phone:919-777-1155Cell/Mobile:--
 
Secondary Contact:Paul Weeks Phone:919-777-1119
Mailing Address:PO Box 3729
Sanford, NC 27331		Cell/Mobile:--
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?   110 Miles
How many feet of distribution lines were replaced during 2025?   0 Feet
How many feet of new water mains were added during 2025?   0 Feet
How many meters were replaced in 2025?   60
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.   No
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 2025?   2,503
Has this system acquired another system since last report?   No

Sanford and Pittsboro (TriRiver Water) merged with Siler City and Chatham County effective July 1, 2025.

Water Use by Type
Type of Use Metered
Connections		 Metered
Average Use (MGD)		 Non-Metered
Connections		 Non-Metered
Estimated Use (MGD)
Residential 1,053 0.1480 0 0.0000
Commercial 87 0.0350 0 0.0000
Industrial 65 0.1200 0 0.0000
Institutional 0 0.0000 0 0.0000

How much water was used for system processes (backwash, line cleaning, flushing, etc.)?   0.0600 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 0.0220 365 0.0250 2029 Yes Yes 6 Regular
Town of Siler City 03-19-010 0.0015 365 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 0.4359 0.9998 May 0.3379 0.9759 Sep 0.4672 1.0193
Feb 0.3546 0.8461 Jun 0.3257 0.9950 Oct 0.4536 1.0055
Mar 0.3886 0.5113 Jul 0.4898 1.5213 Nov 0.4192 0.9610
Apr 0.4612 1.0185 Aug 0.3444 0.9192 Dec 0.5149 1.0266

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 0.3500 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 0.0593 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
  2025 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 0.1480 0.1680 0.1860 0.2050 0.2390 0.2670
Commercial 0.0350 0.0430 0.0480 0.0530 0.0610 0.0690
Industrial 0.1200 0.0780 0.0860 0.0950 0.1100 0.1230
Institutional 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
System Process 0.0600 0.0630 0.0690 0.0770 0.0890 0.1000
Unaccounted-for 0.0228 0.0220 0.0250 0.0270 0.0320 0.0360

Demand projections were developed under regional utility master planning studies for Chatham County North by TriRiver Water. Average day raw water demands are shown.

Future Supply Sources
Source Name PWSID Source Type Additional Supply Year Online Year Offline Type
Chatham County Asbury System 40-19-010 Purchase 1.7500 2030 Regular

The Asbury Water System needs to sell 1.7 MGD to the Southwest Water System to account for the up to 1 MGD that the Southwest Water System sells to Siler City Water System. Asbury needs to purchase 1.75 MGD from TriRiver Water to achieve this. TriRiver Water's regional planning efforts and evaluation of future water sources are still ongoing and are subject to change.

Demand v/s Percent of Supply
  2025 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 1.7500 1.7500 1.7500 1.7500 1.7500
Total Available Supply (MGD) 0.4700 2.2200 2.2200 2.2200 2.2200 2.2200
Service Area Demand 0.3858 0.3740 0.4140 0.4570 0.5310 0.5950
Sales 0.0235 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) 0.4093 1.3990 1.4390 1.4820 1.5560 1.6200
Demand as Percent of Supply 87% 63% 65% 67% 70% 73%

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 59 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.    Chatham County merged utilities with TriRiver Water and Siler City on July 1, 2025. TriRiver Water's planning efforts and utility management should adequately address the capacity and management issues faced in the future.

Are there other demand management practices you will implement to reduce your future supply needs?    TriRiver Water's regional planning efforts should adequately address demand management practices in the future.

What supplies other than the ones listed in future supplies are being considered to meet your future supply needs?   TriRiver water is conducting ongoing planning efforts to identify future water treatment facilities. Timing, location, and capacity of future water treatment facilities are being evaluated under ongoing planning efforts.

How does the water system intend to implement the demand management and supply planning components above?   TriRiver Water's merger should standardize the technical assistance, funding, and permitting across Pittsboro, Sanford, Siler City, and Chatham County to address demand management and supply planning.

Additional Information

Has this system participated in regional water supply or water use planning?  Yes, Yes, TriRiver Water has engaged in regional utility master planning studies that are ongoing.

What major water supply reports or studies were used for planning?  

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:   

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.