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Gaston County, NC

Water Treatment in Mount Holly, NC

Most of Mount Holly is on City of Mount Holly, and homes outside its lines may use private wells. How to tell which you have, and what each usually needs.
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Local water snapshot

City of Mount Holly

From its 2025 water quality report · read the full report

Water source
Surface water from Mountain Island Lake (Catawba River Basin), on the Gaston/Mecklenburg border
City of Mount Holly serves about 19,200 people.
City of Mount Holly, 2025
Hardness
10.7 mg/L
About 0.6 grains per gallon: soft by USGS classes. As reported (2025).
City of Mount Holly, 2025
Disinfectant
Free chlorine
City of Mount Holly, 2025
TTHM (disinfection byproducts)
45 ppb
Highest running annual average (2025); federal limit 80 ppb.
City of Mount Holly, 2025
HAA5 (disinfection byproducts)
35 ppb
Highest running annual average (2025); federal limit 60 ppb.
City of Mount Holly, 2025
Lead (at sampled homes' taps)
3.5 ppb
90th percentile of homes sampled (2023); 3 sampled homes above the action level. The federal action level is 15 ppb.
City of Mount Holly, 2025
PFOA
Not detected
Not detected. EPA's enforceable limit is 4.0 ppt.
City of Mount Holly, 2025
PFOS
Not detected
Not detected. EPA's enforceable limit is 4.0 ppt.
City of Mount Holly, 2025
Violations
Yes, see report
The report lists one or more violations and explains them. Read it for details.
City of Mount Holly, 2025

What this means for your home

City of Mount Holly is the town's public water system; homes outside its lines may be on other systems or private wells.

  • At 10.7 mg/L (about 0.6 grains per gallon), City of Mount Holly water is soft. You very likely don't need a water softener.
  • City of Mount Holly disinfects with free chlorine. If you notice the taste or smell, NSF/ANSI 42 certified carbon reduces it.
  • Disinfection byproducts (TTHM) were 45 ppb against an 80 ppb limit. That's compliant; some households still prefer a margin, which NSF/ANSI 53 carbon or reverse osmosis provides.
  • 31.9% of homes in Mount Holly were built before 1980. EPA notes homes built before 1986 are more likely to have lead in their plumbing, so a certified-lab lead test at the tap is a sensible first step in an older home.
  • Private wells aren't treated or monitored by a utility. North Carolina only requires a one-time test when a new well is built, so a current certified-lab test is the right starting point.

Private wells in Gaston County

From state testing of private wells. These figures describe the wells that were tested, not every well, so your own certified-lab test is what decides treatment.

Gaston County Environmental Health states that there are more than 8,000 households in Gaston County using groundwater from private wells. Gaston County, NC, 2026

Private-well test results in Gaston County
ContaminantShare of tested wells above the standardWells testedStandardSource
Arsenic2.79%2,76410 µg/LUNC-Chapel Hill Superfund Research Program (NC DHHS private well test data), 2022Oct 1998–May 2019
Lead2.03%2,76315 µg/LUNC-Chapel Hill Superfund Research Program (NC DHHS private well test data), 2022Oct 1998–May 2019
Copper0.3%1,6721,300 µg/LUNC-Chapel Hill Superfund Research Program (NC DHHS private well test data), 2022Oct 1998–May 2019
Nitrate1.6%81210,000 µg/L (10 mg/L)UNC-Chapel Hill Superfund Research Program (NC DHHS private well test data), 2022Oct 1998–May 2019
Iron24.36%1,6872,500 µg/LUNC-Chapel Hill Superfund Research Program (NC DHHS private well test data), 2022Oct 1998–May 2019
Manganese18.22%2,782300 µg/LUNC-Chapel Hill Superfund Research Program (NC DHHS private well test data), 2022Oct 1998–May 2019

How we approach well water

Recommended for Mount Holly homes

Based on the data above. Your own test results always come first.
Chlorine taste & odorCertified carbon at the kitchen tap or for the whole home.Drinking-water reverse osmosisNSF/ANSI 58 RO at the kitchen tap.Water testingCertified-lab lead and full-panel testing.Well water treatmentLab test first, then neutralizer, iron/manganese, arsenic or UV as results require.Whole-home filtrationSediment plus catalytic carbon for the whole house.

How it works

  1. Step 1

    Test

    We read your utility's report with you, and run a certified-lab test when your home calls for one.

  2. Step 2

    Design

    You get a written recommendation and quote for only what the data supports.

  3. Step 3

    Licensed install

    An independent licensed plumber installs under a separate agreement with you.

  4. Step 4

    Retest

    We confirm the system is doing what it's certified to do.

More on how it works

Mount Holly at a glance

Population
19,033
July 2025 estimate · U.S. Census Bureau, 2025
Households
7,307
U.S. Census Bureau (via Census Reporter), 2024
Owner-occupied homes
68.8%
U.S. Census Bureau (via Census Reporter), 2024
Median home value
$337,800
U.S. Census Bureau (via Census Reporter), 2024
Homes built before 1980
31.9%
U.S. Census Bureau (via Census Reporter), 2024

Mount Holly water questions

Who supplies water in Mount Holly?

City of Mount Holly is the town's public water system; homes outside its lines may be on other systems or private wells. Its supply is surface water from mountain island lake (catawba river basin), on the gaston/mecklenburg border. EPA's registry lists it serving about 19,200 people.

Is Mount Holly water hard?

City of Mount Holly reported hardness of 10.7 mg/L in its 2025 report, which is soft by USGS classes. Most homes on it don't need a softener.

Does City of Mount Holly report PFAS?

PFOA and PFOS were not detected in the results it reported. EPA's enforceable limits for PFOA and PFOS are 4.0 parts per trillion; other proposed PFAS limits are under review.

Do homes in Gaston County use private wells?

Gaston County Environmental Health states that there are more than 8,000 households in Gaston County using groundwater from private wells. In state testing of private wells in Gaston County, 2.79% of 2,764 private wells tested (77 wells) were above the 10 µg/L EPA drinking water standard (MCL) for arsenic. These figures describe the wells that were tested, not every well in the county.

How old are homes in Mount Holly, and does that matter for water?

Census estimates put 31.9% of Mount Holly homes as built before 1980. Lead usually comes from a home's own plumbing, not the utility, so in older homes a certified-lab lead test at the tap is the honest starting point.

Do you serve Mount Holly?

Yes. Mount Holly is about 25 minutes from our Charlotte base. Installation is performed by an independent, NC-licensed plumbing contractor under a separate agreement with you.

Do I need a permit to install a water treatment system?

Whole-house treatment is plumbing work in North Carolina. Your independent licensed plumber determines and pulls any permit Gaston County requires.

Nearby areas we serve

All of Gaston CountyEvery county and town we serveLook up your water by ZIP

Get an honest answer about Mount Holly water.

Tell us about your home and water source. We'll recommend testing first, and only the equipment your results support.

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