Siler City

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: Siler City   PWSID: 03-19-010
Mailing Address:PO. Box 769
Siler City, NC 27344		Ownership:Municipality
 
Contact Person:Jason BertoncinoTitle:Public Utilities Director
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
Asbestos Cement 6-12 20.00 %
Cast Iron 4-16 12.00 %
Ductile Iron 4-16 15.00 %
Galvanized Iron 2 8.00 %
Polyvinyl Chloride 2-12 45.00 %
What are the estimated total miles of distribution system lines?   107 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?   261
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?   3.5000 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, Semi-Annually
Does this system have a valve exercise program?   Yes, Semi-Annually
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?   Flat/Fixed, Uniform
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?   8,520
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 3,818 0.4703 0 0.0000
Commercial 469 0.2283 0 0.0000
Industrial 1 0.9983 0 0.0000
Institutional 8 0.1751 0 0.0000

How much water was used for system processes (backwash, line cleaning, flushing, etc.)?   0.2200 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
Chatham County 03-19-050 0.0593 365 0.0700 2029 Yes Yes 8&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 2.9800 3.6800 May 2.8200 3.6700 Sep 2.8600 3.6200
Feb 2.7500 3.5200 Jun 2.7400 3.6400 Oct 3.0300 3.6200
Mar 2.7600 3.6700 Jul 2.8700 3.4300 Nov 2.7300 3.5600
Apr 2.6600 3.3200 Aug 2.8000 3.6200 Dec 2.6600 3.5700

Surface Water Sources
Stream Reservoir Average Daily Withdrawal Maximum Day
Withdrawal (MGD)		 Available Raw
Water Supply		 Usable On-Stream
Raw Water Supply
Storage (MG)
MGD Days Used MGD * Qualifier
Rocky River Upper and Lower 2.4500 365 0.0000 4.0000 SY20 440.0000

* Qualifier: C=Contract Amount, SY20=20-year Safe Yield, SY50=50-year Safe Yield, F=20% of 7Q10 or other instream flow requirement, CUA=Capacity Use Area Permit

Surface Water Sources (continued)
Stream Reservoir Drainage Area
(sq mi)		 Metered? Sub-Basin County Year
Offline		 Use
Type
Rocky River Upper and Lower 92 Yes Deep River (02-2) Chatham Regular
What is this system's off-stream raw water supply storage capacity?   0 Million gallons
Are surface water sources monitored?   Yes, As Needed
Are you required to maintain minimum flows downstream of its intake or dam?   Yes
Does this system anticipate transferring surface water between river basins?   No
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
South Chatham Water System 03-19-050 0.0023 365 1.0000 2029 Yes Yes 12 Regular
Water Treatment Plants
Plant Name Permitted Capacity
(MGD)		 Is Raw Water Metered? Is Finished Water Ouput Metered? Source
Siler City Water Treatment Pla 4.0000 Yes Yes Rocky River
Did average daily water production exceed 80% of approved plant capacity for five consecutive days during 2025?  No
     If yes, was any water conservation implemented?  No
Did average daily water production exceed 90% of approved plant capacity for five consecutive days during 2025?  No
     If yes, was any water conservation implemented?  No
Are peak day demands expected to exceed the water treatment plant capacity in the next 10 years?  Yes

Expansion to 6 MGD of the Siler City WTP is planned.

4. Wastewater Information

Monthly Discharges
Average Daily
Discharge (MGD)		 Average Daily
Discharge (MGD)		 Average Daily
Discharge (MGD)
Jan 2.5500 May 2.7800 Sep 2.0900
Feb 3.1200 Jun 2.5700 Oct 2.0700
Mar 2.6700 Jul 2.7400 Nov 2.0390
Apr 2.6700 Aug 2.9900 Dec 2.2300

How many sewer connections does this system have?   3,546
How many water service connections with septic systems does this system have?   379
Are there plans to build or expand wastewater treatment facilities in the next 10 years?   Yes

Siler City WWTP is under construction to expand to 6 MGD.

Wastewater Permits
Permit Number Type Permitted Capacity
(MGD)		 Design Capacity
(MGD)		 Average Annual
Daily Discharge
(MGD)		 Maximum Day Discharge
(MGD)		 Receiving Stream Receiving Basin
NC0026441 WWTP 4.0000 4.0000 2.5960 4.7810 Loves Creek Deep River (02-2)

5. Planning

Projections
  2025 2030 2040 2050 2060 2070
Year-Round Population 8,520 8,827 10,655 12,622 14,952 17,712
Seasonal Population 0 0 0 0 0 0
 
Residential 0.4703 0.7000 1.1800 1.6400 1.7600 1.9500
Commercial 0.2283 0.3400 0.5700 0.8000 0.8500 0.9400
Industrial 0.9983 0.8900 1.5100 2.1200 2.3200 2.5100
Institutional 0.1751 1.2700 2.1600 3.0900 3.4100 3.6400
System Process 0.2200 0.4100 0.6950 0.9800 1.0700 1.1700
Unaccounted-for 0.3010 0.4900 0.8300 1.1800 1.2900 1.3900

Demand projections were developed under regional utility master planning studies for Siler City by TriRiver Water. The CAM Mega Site and Wolfspeed, Inc. had distinct demand projections developed internally which are incorporated into the demands shown. Average day raw water demands are shown.

Future Supply Sources
Source Name PWSID Source Type Additional Supply Year Online Year Offline Type
City of Asheboro 02-76-010 Purchase 2.0000 2027 Regular
Rocky River 03-19-010 Surface 4.0000 2035 Regular
Sanford 03-53-010 Surface 2.0000 2060 Regular

TriRiver Water is conducting ongoing planning efforts to identify future water treatment facilities. This data assumes that the Siler City Water Plant will expand to 8 MGD, Asheboro can provide 2 MGD for purchase, and TriRiver Water will supply the remaining demands. TriRiver Water's regional planning efforts are still ongoing and are subject to change.

Demand v/s Percent of Supply
  2025 2030 2040 2050 2060 2070
Surface Water Supply 4.0000 4.0000 4.0000 4.0000 4.0000 4.0000
Ground Water Supply 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Purchases 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000
Future Supplies 2.0000 6.0000 6.0000 8.0000 8.0000
Total Available Supply (MGD) 5.0000 7.0000 11.0000 11.0000 13.0000 13.0000
Service Area Demand 2.3930 4.1000 6.9450 9.8100 10.7000 11.6000
Sales 0.0593 0.0700 0.0700 0.0700 0.0700 0.0700
Future Sales 0.0000 0.0000 0.0000 0.0000 0.0000
Total Demand (MGD) 2.4523 4.1700 7.0150 9.8800 10.7700 11.6700
Demand as Percent of Supply 49% 60% 64% 90% 83% 90%

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 55 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.    Siler City merged utilities with TriRiver Water and Chatham County 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.