Water hardness in Seminole
12.1 gpg very hard
Tap water in Seminole is very hard: 12.1 gpg (207 mg/L · 11.6 °dH · 20.7 °fH).
Source: Pinellas County Utilities 2021 Consumer Confidence Report (2021) · data checked 2026-10-29
Range across supply zones: 174–239 mg/L.
This figure is over 3 years old; hardness may have changed.
Seminole is supplied wholesale by Pinellas County Utilities. Its 2021 Consumer Confidence Report gives a median hardness of 207 mg/L, with a range of 174 to 239 mg/L, which is very hard. The report is from 2021, so check for a newer one. Scale on fixtures and appliances is likely.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 12.1 gpg |
|---|---|
| Utility | Pinellas County Utilities (wholesale supplier) |
How Seminole compares
- Tap water in Seminole is 34 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 506 of 1372 in the United States (1 = hardest); 63 % of these cities have softer water.
- In Florida it is number 5 of 17 cities; the regional median is 8.2 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 Seminole
| 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 Seminole water hard or soft?
It is very hard: 207 mg/L as CaCO₃ (12.1 gpg, 11.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Seminole 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 Seminole water?
12.1 gpg, equal to 11.6 °dH, 20.7 °fH or 207 mg/L calcium carbonate.
What dishwasher salt setting should I use in Seminole?
For 207 mg/L (11.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Seminole?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Pinellas County Utilities 2021 Consumer Confidence Report (2021). Method: figure published by the water supplier. Pinellas County Utilities 2021 Consumer Confidence Report · Outdated figure? Tell us