Quick Answer: Newark water is moderately hard, 4 to 7 grains per gallon (gpg), sourced from Passaic River watershed reservoirs. Newark experienced a lead contamination crisis (2016–2021) due to its aging lead service line network — one of the most significant lead crises after Flint. Although a major replacement program has been completed, some risk remains in homes with older plumbing. A lead-certified filter for drinking water is strongly recommended.
Is Newark Water Hard or Soft?
Newark Water Hardness Data
According to City of Newark — Newark Watershed Conservation and Development Corporation annual water quality reports, Newark water hardness ranges from 4 to 7 grains per gallon (gpg) — classified as moderately hard. The city uses chloramine as its primary disinfectant, which requires catalytic carbon filters (not standard activated carbon) for effective removal. See the home water hardness test guide to verify your specific tap's hardness level.
Where Does Newark Get Its Water?
Newark draws its drinking water from Pequannock, Wanaque, and Boonton Reservoirs (Passaic River watershed), managed by City of Newark — Newark Watershed Conservation and Development Corporation.
Newark draws its water from three reservoirs in the Passaic River watershed: Pequannock Reservoir (Morris County), Wanaque Reservoir (Passaic County), and Boonton Reservoir (Morris County). These highland reservoirs in northern New Jersey collect naturally moderate-hardness water from mixed geology. The Clinton Water Treatment Plant in Newark treats all surface water. Newark's lead crisis stemmed not from the source water but from the city's extensive network of lead service lines and lead-soldered plumbing in older homes — the source water itself is lead-free when it leaves treatment.
What Contaminants Are in Newark Water?
According to City of Newark — Newark Watershed Conservation and Development Corporation annual water quality reports and independent EWG Tap Water Database analysis, the primary concerns in Newark drinking water include:
- Disinfection Byproducts: Newark uses chloramine to disinfect water. When chloramine reacts with natural organic matter, it forms trihalomethanes (TTHMs) and haloacetic acids (HAA5) — compounds linked to increased cancer risk with long-term exposure.
- Key Concerns: Lead from Newark's extensive lead service line network (Newark had a well-publicized lead crisis 2016-2021, prompting free filter distribution), PFAS from industrial sources, and disinfection byproducts.
- Agricultural and Urban Runoff: Depending on watershed proximity to farmland or industry, nitrates, pesticides, and industrial chemicals may be present at low levels.
Hard Water Effects in Newark
At 4–7 gpg, Newark water is moderately hard, meaning some scale buildup may occur on faucets and appliances over time, though it is less aggressive than very hard water cities.
While Newark's water is moderately hard and does not cause severe scale problems, a home hardness test can confirm your specific levels and help you decide if any treatment is worthwhile.
Best Water Treatment Solutions for Newark Homes
1. Water Softener — No
No — at 4–7 gpg, Newark's water is moderately hard but water softening is less urgent than lead removal. For Newark's moderately hard water, a full water softener is generally unnecessary. However, a salt-free water conditioner (template-assisted crystallization) can help reduce any minor scale on fixtures without adding sodium to water.
2. Whole-Home Carbon Filtration
A whole-home carbon filter removes chloramine, disinfection byproducts (TTHMs, HAA5), chlorine taste and odor, and many industrial chemicals before water enters your home's plumbing. For chloramine-treated water like Newark's, use a catalytic carbon filter — standard activated carbon removes chloramine much less effectively.
3. Reverse Osmosis System (Drinking Water)
For drinking and cooking water, a reverse osmosis (RO) system under the kitchen sink is the most comprehensive solution. RO removes dissolved minerals to near-zero levels, plus filters out PFAS, nitrates, heavy metals, radium, disinfection byproducts, and most other contaminants of concern in Newark water. Look for NSF/ANSI 58-certified systems. See our guide on water treatment options for 2026.
Newark Water Hardness vs. Other Major Cities
| City | Hardness (gpg) | Classification |
|---|---|---|
| Las Vegas, NV | 16–18 | Extremely Hard |
| Phoenix, AZ | ~16 | Extremely Hard |
| Dallas, TX | ~14 | Very Hard |
| Newark, NJ | 4–7 | Moderately Hard |
| Chicago, IL | ~8.2 | Hard |
| Ottawa, ON | 2.5–5 | Soft to Moderately Soft |
| Seattle, WA | ~1.2 | Soft |
How to Test Your Water Hardness at Home
You can verify Newark's water hardness at your specific tap using these simple methods:
- Test strips: Dip a water hardness test strip in a glass of cold tap water. Results appear in seconds. Accuracy: ±1–2 gpg. Inexpensive and widely available.
- The soap test: Fill a clear bottle halfway with tap water, add 10 drops of pure liquid castile soap, and shake vigorously. Abundant, persistent suds = soft water. Milky, soapy film with few suds = hard water.
- Visual check: White crusty deposits inside your toilet tank, on showerheads, or around faucet bases are limescale — a reliable sign of hard water above ~7 gpg.
- Lab test: For precise results, send a water sample to a certified lab. This also tests for contaminants beyond hardness. See our full home water testing guide.