Mount Holly

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: Mount Holly   PWSID: 01-36-020
Mailing Address:P.O. Box 406
Mount Holly, NC 28120		Ownership:Municipality
 
Contact Person:Jeff WomackTitle:Division Manager/ORC
Phone:704-822-2928Cell/Mobile:--
 
Secondary Contact:Robert Stewart Phone:704-951-0074
Mailing Address:P.O. Box 406
Mount Holly, NC 28120		Cell/Mobile:--
Distribution System
Line Type Size Range (Inches) Estimated % of lines
Asbestos Cement 6-10 1.00 %
Cast Iron 6-10 3.00 %
Ductile Iron 3-20 82.00 %
Galvanized Iron 2 5.00 %
Polyvinyl Chloride 2-6 9.00 %
What are the estimated total miles of distribution system lines?   132 Miles
How many feet of distribution lines were replaced during 2024?   0 Feet
How many feet of new water mains were added during 2024?   2,800 Feet
How many meters were replaced in 2024?   290
How old are the oldest meters in this system?   17 Year(s)
How many meters for outdoor water use, such as irrigation, are not billed for sewer services?   438
What is this system's finished water storage capacity?   6.0000 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, Annually
Does this system have a valve exercise program?   No
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?   No
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
Catawba River (03-1)100 %
County(s)% of Service Population
Gaston100 %
What was the year-round population served in 2024?   21,281
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 7,882 1.1329 0 0.0000
Commercial 307 0.1842 0 0.0000
Industrial 16 0.5345 0 0.0000
Institutional 76 0.0458 0 0.0000

How much water was used for system processes (backwash, line cleaning, flushing, etc.)?   0.1913 MGD

Backwash Water - 0.0551
Flushing Program - 0.0041
Basin Washes & other Plant Process - 0.187 (Taken from Hach Flodar)

Our wholesale should be added to this section as we meter and withdraw an average of 0.8123 MGD to the Town of Stanley. The Town of Stanley uses 0.5409 MGD, Mount Holly uses 0.2714 MGD from the Stanley Tank.

The report volume of Industrial water use in 2024 includes 0.2703 MGD of raw water supplied to National Gypsum.

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
City of Belmont 01-36-015 0.0000 0 2028 Yes Yes 8 Emergency
Stanley 01-36-035 0.5409 366 0.6000 2035 No Yes 12 Regular

Review of current water sales agreement with the Town of Stanley shows an agreement beginning in 2005 for 600,000 gallons of water per day. Mount Holly and Stanley are currently negotiating a new agreement for 20 years which shall supersede prior agreements with a 100,000 gallons per day increase up to 700,000 gallons of water per day. If finalized this year -- in 2025, the additional 100,000 gpd in sales will be shown in next year's (2025) LWSP.

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 2.5922 2.9660 May 2.7446 3.1560 Sep 2.9039 4.2300
Feb 2.6057 3.2340 Jun 3.1906 4.1450 Oct 2.9240 3.6570
Mar 2.6984 3.0450 Jul 3.1837 4.0210 Nov 2.5863 3.1050
Apr 2.5714 3.0440 Aug 2.9360 3.9140 Dec 2.4069 2.7870

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
Catawba Mt. Island lake 2.7868 365 0.0000 13.5000 C 334.0000

* 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
Catawba Mt. Island lake 1,860 Yes Catawba River (03-1) Gaston Regular
What is this system's off-stream raw water supply storage capacity?   0 Million gallons
Are surface water sources monitored?   Yes, Quarterly
Are you required to maintain minimum flows downstream of its intake or dam?   No
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
City of Belmont 01-36-015 0.0000 0 0.0000 2039 Yes Yes 8 Emergency
Water Treatment Plants
Plant Name Permitted Capacity
(MGD)		 Is Raw Water Metered? Is Finished Water Ouput Metered? Source
Mount Holly WTP 6.0000 Yes Yes Mt. Island Lake
Did average daily water production exceed 80% of approved plant capacity for five consecutive days during 2024?  No
     If yes, was any water conservation implemented?  
Did average daily water production exceed 90% of approved plant capacity for five consecutive days during 2024?  No
     If yes, was any water conservation implemented?  
Are peak day demands expected to exceed the water treatment plant capacity in the next 10 years?  No

4. Wastewater Information

Monthly Discharges
Average Daily
Discharge (MGD)		 Average Daily
Discharge (MGD)		 Average Daily
Discharge (MGD)
Jan 2.6210 May 2.1200 Sep 2.9240
Feb 1.8990 Jun 1.5950 Oct 1.9060
Mar 2.4280 Jul 2.1250 Nov 1.8090
Apr 1.9910 Aug 2.3070 Dec 1.6910

How many sewer connections does this system have?   7,225
How many water service connections with septic systems does this system have?   445
Are there plans to build or expand wastewater treatment facilities in the next 10 years?   No

Mount Holly Wastewater with Charlotte Wastewater are building a new facility on the Charlotte side of the Catawba River with a online date of late summer, early fall 2025.

Wastewater Permits
Permit Number Type Permitted Capacity
(MGD)		 Design Capacity
(MGD)		 Average Annual
Daily Discharge
(MGD)		 Maximum Day Discharge
(MGD)		 Receiving Stream Receiving Basin
NC0021156 WWTP 4.0000 4.0000 2.1180 Catawba River Catawba River (03-1)

5. Planning

Projections
  2024 2030 2040 2050 2060 2070
Year-Round Population 21,281 24,200 29,766 36,612 45,033 55,391
Seasonal Population 0 24,675 30,350 37,331 45,917 56,477
 
Residential 1.1329 1.2900 1.5770 1.8924 2.2709 2.7251
Commercial 0.1842 0.1953 0.2148 0.2363 0.2599 0.2859
Industrial 0.5345 0.2801 0.3081 0.3389 0.3727 0.4100
Institutional 0.0458 0.0486 0.0534 0.0588 0.0646 0.0711
System Process 0.1913 0.2612 0.2873 0.3160 0.3476 0.3824
Unaccounted-for 0.1496 0.2000 0.1840 0.2263 0.2584 0.3024
Demand v/s Percent of Supply
  2024 2030 2040 2050 2060 2070
Surface Water Supply 13.5000 13.5000 13.5000 13.5000 13.5000 13.5000
Ground Water Supply 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Purchases 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Future Supplies 0.0000 0.0000 0.0000 0.0000 0.0000
Total Available Supply (MGD) 13.5000 13.5000 13.5000 13.5000 13.5000 13.5000
Service Area Demand 2.2383 2.2752 2.6246 3.0687 3.5741 4.1769
Sales 0.5409 0.6000 0.0000 0.0000 0.0000 0.0000
Future Sales 0.0000 0.0000 0.0000 0.0000 0.0000
Total Demand (MGD) 2.7792 2.8752 2.6246 3.0687 3.5741 4.1769
Demand as Percent of Supply 21% 21% 19% 23% 26% 31%

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 53 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.    

Are there other demand management practices you will implement to reduce your future supply needs?   

What supplies other than the ones listed in future supplies are being considered to meet your future supply needs?   

How does the water system intend to implement the demand management and supply planning components above?   

Additional Information

Has this system participated in regional water supply or water use planning?  Yes, Yes, Catawba Wateree Management Group

What major water supply reports or studies were used for planning?  Catawba Wateree Management Group

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.