Water hardness in Woburn
4.8 gpg moderately hard
Tap water in Woburn is moderately hard: 4.8 gpg (83 mg/L · 4.6 °dH · 8.3 °fH).
Source: MWRA-hosted City of Woburn 2023 water quality report (2023) · data checked 2026-11-02
Woburn's water comes from the city's Horn Pond treatment plant, supplemented by the MWRA. The 2023 city report puts hardness at 83 mg/L as CaCO3, in the moderate range. That is enough for a thin white film on glassware, but heavy scale is less likely than in harder systems.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 4.8 gpg |
|---|---|
| Utility | City of Woburn DPW (Horn Pond WTP) + MWRA |
How Woburn compares
- Tap water in Woburn is 46 % softer than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 1094 of 1372 in the United States (1 = hardest); 20 % of these cities have softer water.
- In Massachusetts it is number 2 of 13 cities; the regional median is 1.9 gpg.
Ranking of the hardest and softest water in the United States →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Woburn
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °dH |
| AEG / Electrolux | 2 |
| Beko | 1st |
| Hoover | S1 |
| LG | H1 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Woburn water hard or soft?
It is moderately hard: 83 mg/L as CaCO₃ (4.8 gpg, 4.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Woburn safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
How many grains per gallon is Woburn water?
4.8 gpg, equal to 4.6 °dH, 8.3 °fH or 83 mg/L calcium carbonate.
What dishwasher salt setting should I use in Woburn?
For 83 mg/L (4.6 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Woburn?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: MWRA-hosted City of Woburn 2023 water quality report (2023). Method: figure published by the water supplier. MWRA-hosted City of Woburn 2023 water quality report · Outdated figure? Tell us