Water hardness in Tampa
12.3 gpg very hard
Tap water in Tampa is very hard: 12.3 gpg (211 mg/L · 11.8 °dH · 21.1 °fH).
Source: City of Tampa 2025 Water Quality Report (2025) · data checked 2026-10-19
The City of Tampa's 2025 report states that average total hardness of finished water was 211 mg/L (12.3 gpg). That is very hard water. The city's 2024 report gave 185 mg/L, so the figure moves from year to year. Scale builds up on heaters and fixtures.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 12.3 gpg |
|---|---|
| Utility | City of Tampa Water Department |
How Tampa compares
- Tap water in Tampa is 36 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 486 of 1372 in the United States (1 = hardest); 65 % of these cities have softer water.
- In Florida it is number 4 of 17 cities; the regional median is 8.2 gpg.
- Nearest city with clearly softer water: St. Petersburg FL, 27 km away (9.2 gpg).
Ranking of the hardest and softest water in the United States →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Tampa
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 12 °dH |
| AEG / Electrolux | 3 |
| Beko | 3rd |
| Hoover | S2 |
| LG | H2 |
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 Tampa water hard or soft?
It is very hard: 211 mg/L as CaCO₃ (12.3 gpg, 11.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Tampa 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 Tampa water?
12.3 gpg, equal to 11.8 °dH, 21.1 °fH or 211 mg/L calcium carbonate.
What dishwasher salt setting should I use in Tampa?
For 211 mg/L (11.8 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Tampa?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: City of Tampa 2025 Water Quality Report (2025). Method: figure published by the water supplier. City of Tampa 2025 Water Quality Report · Outdated figure? Tell us