Water hardness in Castle Pines
8.5 gpg hard
Tap water in Castle Pines is hard: 8.5 gpg (146 mg/L · 8.2 °dH · 14.6 °fH).
Source: Castle Pines Metropolitan District 2025 Drinking Water CCR (calendar year 2024) (2024) · data checked 2026-10-29
Range across supply zones: 120–171 mg/L.
Castle Pines, Colorado, is served by the Castle Pines Metropolitan District. The median of 145.5 mg/L as CaCO₃ is computed from the 2025 Consumer Confidence Report, which covers calendar year 2024, with values from 119.8 to 171.2 mg/L. That is hard water.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 8.5 gpg |
|---|---|
| Utility | Castle Pines Metropolitan District |
How Castle Pines compares
- Tap water in Castle Pines is 6 % softer than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 738 of 1372 in the United States (1 = hardest); 46 % of these cities have softer water.
- In Colorado it is number 2 of 11 cities; the regional median is 6.1 gpg.
Ranking of the hardest and softest water in the United States →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Castle Pines
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 8 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| 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 Castle Pines water hard or soft?
It is hard: 146 mg/L as CaCO₃ (8.5 gpg, 8.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Castle Pines 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 Castle Pines water?
8.5 gpg, equal to 8.2 °dH, 14.6 °fH or 146 mg/L calcium carbonate.
What dishwasher salt setting should I use in Castle Pines?
For 146 mg/L (8.2 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Castle Pines?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Castle Pines Metropolitan District 2025 Drinking Water CCR (calendar year 2024) (2024). Method: computed from supplier's calcium and magnesium. Castle Pines Metropolitan District 2025 Drinking Water CCR (calendar year 2024) · Outdated figure? Tell us