Scotch Plains Water Hardness & Quality Report (2026)
Water Hardness
6.3 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
225.3 mg/L
Est. Daily Cost
$0.29
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 Scotch Plains, your appliances are currently losing 14% efficiency due to mineral buildup.
| Appliance | In Scotch Plains | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6 yrs | 8.5 yrs | -29% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 11.3 yrs | 15 yrs | -25% |
Regional Water Comparison
How Scotch Plains compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Scotch Plains, New Jersey | 108 mg/L | 9 ppt | 🟡 Moderately Hard | reservoir |
| Plainfield, New Jersey | 156 mg/L | 11.7 ppt | 🟠 Hard | reservoir |
| Westfield, New Jersey | 66 mg/L | 6.7 ppt | 🟡 Moderately Hard | reservoir |
| New Providence, New Jersey | 101.5 mg/L | 8.6 ppt | 🟡 Moderately Hard | reservoir |
| North Plainfield, New Jersey | 110.5 mg/L | 9.2 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Scotch Plains compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Scotch Plains | 108 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Scotch Plains's Water Unique?
Local geology and source profile
Scotch Plains, New Jersey, in Union County in the central New Jersey suburban corridor west of Westfield and Fanwood — an affluent suburban township with a charming historic downtown and well-regarded schools — receives its municipal water from New Jersey American Water (NJAW), drawing from the Wanaque Reservoir in Passaic County's New Jersey Highlands and the Raritan River basin reservoir system (Round Valley and Spruce Run reservoirs). NJAW operates a statewide water supply grid that moves water between reservoir systems to balance supply and demand across its New Jersey service territory.
The moderately soft 108 mg/L hardness and TDS of 225.3 mg/L reflect the influence of Wanaque Reservoir supply in the Union County system. The Wanaque watershed drains the Precambrian New Jersey Highlands — an ancient terrane of Proterozoic gneisses, granites, and iron-bearing metasedimentary rocks that form the Ramapo and Green Pond Mountain ridgelines — crystalline rocks with negligible carbonate content. This pristine Highland reservoir water produces soft supply that moderates the moderately hard Raritan basin contribution when blended for Union County distribution.
At 108 mg/L, Scotch Plains' water is moderately soft — comfortable for everyday household use in this prosperous Union County community. Scale forms gradually in kettles and appliances over months, soap lathers well, and the dishwasher produces clean results. Quarterly descaling of heating appliances is adequate. The elevated PFAS level of 9.0 ppt is a significant concern — Union County's dense suburban industrial corridor, proximity to former petroleum refineries and chemical plants along the New Jersey Turnpike corridor, and the area's CERCLA Superfund site legacy contribute to elevated PFAS in the regional water supply. A certified reverse osmosis filter for drinking and cooking water is strongly advisable for Scotch Plains households.
Geology & Source: Scotch Plains in Union County is served by New Jersey American Water drawing from the Wanaque Reservoir in the NJ Highlands or the Raritan River basin supply — the Wanaque watershed drains Precambrian Highland granites and gneisses with negligible carbonate — crystalline Highland reservoir water produces moderately soft water at 108 mg/L for this Union County community.