Holly Springs Water Hardness & Quality Report (2026)
Water Hardness
5.2 grains per gallon
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
158.4 mg/L
Est. Daily Cost
$0.24
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Holly Springs, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Holly Springs | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.7 yrs | 8.5 yrs | -21% |
| Washing Machine | 10.3 yrs | 12 yrs | -14% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Holly Springs compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Holly Springs, North Carolina | 89 mg/L | 4.7 ppt | 🟡 Moderately Hard | reservoir |
| Fuquay-Varina, North Carolina | 132.5 mg/L | 6.9 ppt | 🟠 Hard | reservoir |
| Apex, North Carolina | 167.5 mg/L | 8.7 ppt | 🟠 Hard | reservoir |
| Cary, North Carolina | 120.5 mg/L | 6.3 ppt | 🟠 Hard | reservoir |
| Morrisville, North Carolina | 128 mg/L | 6.7 ppt | 🟠 Hard | reservoir |
National Benchmark
How Holly Springs compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Holly Springs | 89 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Holly Springs home
Shop water softeners on Amazon.com →
What Makes Holly Springs's Water Unique?
Local geology and source profile
Holly Springs, North Carolina, in Wake County — a major southwest Wake County Research Triangle suburban community (Holly Springs is one of the fastest-growing towns in North Carolina and one of the fastest-growing in the United States — a Wake County community in the southwest Research Triangle Park corridor that has seen explosive population growth since the 1990s, driven by technology industry and pharmaceutical company relocations to the RTP area; Holly Springs is adjacent to Research Triangle Park and the new Fujifilm Diosynth Biotechnologies facility (one of the largest biopharmaceutical manufacturing investments in North Carolina history)), a diverse Wake County community with a significant professional, Indian-American, Chinese-American, and growing suburban family population, home of significant new master-planned residential communities (Holly Springs is one of the primary destinations for families moving to the Raleigh-Durham metro), and a community that has nearly doubled in population each decade since 1990 — draws its municipal water supply via the Town of Holly Springs Public Utilities. Water hardness in Holly Springs measures 89 mg/L — classified as moderately soft.
Holly Springs's moderate softness reflects the south Wake County Carolina Piedmont watershed's calcareous-poor geology. The Harris Lake watershed at Holly Springs–Wake County drains the Triassic Deep River Basin arkose and Precambrian Carolina Slate Belt (calcareous-poor). Town of Holly Springs applies effective treatment, producing the moderately soft 89 mg/L.
With hardness at 89 mg/L, Holly Springs residents enjoy moderately soft water. Holly Springs Public Utilities consistently delivers water meeting all North Carolina DEQ and EPA Safe Drinking Water Act requirements.
Geology & Source: Reservoir supply from the Harris Lake (Cape Fear River watershed) via the Town of Holly Springs Public Utilities or Harnett County — the Wake County southwest North Carolina Research Triangle corridor (Triassic calcareous-poor Deep River Basin sandstone and Precambrian calcareous-poor Carolina Slate Belt — the calcareous-poor south Wake County Carolina Piedmont watershed; effective treatment); moderately soft supply at 89 mg/L in Wake County.