Castle Pines North Water Hardness & Quality Report (2026)
Water Hardness
8.4 grains per gallon
Source
reservoir
pH Level
8
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
356.5 mg/L
Est. Daily Cost
$0.39
energy & soap waste
Source: See methodology section below · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Castle Pines North, your appliances are currently losing 19% efficiency due to mineral buildup.
| Appliance | In Castle Pines North | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.9 yrs | 8.5 yrs | -19% |
| Washing Machine | 9.7 yrs | 12 yrs | -19% |
| Water Heater | 12.2 yrs | 15 yrs | -19% |
Regional Water Comparison
How Castle Pines North compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Castle Pines North, Colorado | 144.5 mg/L | 16.1 ppt | 🟠 Hard | reservoir |
| Lone Tree, Colorado | ≈ 120–179 mg/L | 3.3 ppt | 🟠 Hard | reservoir |
| Castle Rock, Colorado | ≈ 120–179 mg/L | 12.8 ppt | 🟠 Hard | reservoir |
| Centennial, Colorado | ≈ 180+ mg/L | 3.7 ppt | 🔴 Very Hard | reservoir |
| Highlands Ranch, Colorado | ≈ 120–179 mg/L | 49.6 ppt | 🟠 Hard | reservoir |
National Benchmark
How Castle Pines North compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Castle Pines North | 144.5 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Castle Pines North's Water Unique?
Local geology and source profile
Castle Pines North, Colorado, in Douglas County — a Douglas County community adjacent to Castle Rock and Lone Tree in the south Denver metro — receives its water from the Castle Pines Metropolitan District, drawing from the Rueter-Hess Reservoir and blended South Platte sources through the south metro Colorado distribution.
The hard 144.5 mg/L hardness and TDS of 356.5 mg/L reflect the Douglas County supply's hard blended character — while the Precambrian Pikes Peak Granite provides insoluble dilution, Castle Pines North draws from a blend that incorporates harder Parker Water supply zones; the distribution network concentrates moderately higher mineral content than the upstream Rueter-Hess Reservoir (compare Castle Rock CO: 140/346 in Douglas County comparable; Lone Tree CO: 148/367 in Douglas County comparable; Castle Pines North consistent hard from the same Douglas County Rueter-Hess Reservoir Precambrian supply). The South Platte blended supply — Precambrian Pikes Peak Granite (insoluble — primary dilutant), Cretaceous Pierre Shale (slightly calcareous — primary hardness contributor), and Quaternary South Platte alluvium (calcareous — TDS contributor).
At 144.5 mg/L with TDS 357, Castle Pines North's water is hard — scale builds in appliances. Quarterly descaling is appropriate. The PFAS level of 5.0 ppt warrants a certified drinking water filter. Review the Castle Pines Metropolitan District's annual water quality report.
Geology & Source: Castle Pines North in Park County draws from the Castle Pines Metro District on the Rueter-Hess Reservoir supply (Park/Douglas County, south metro Colorado) — the South Platte Front Range draws from Precambrian Pikes Peak Granite (insoluble) and Cretaceous Pierre Shale (slightly calcareous) — Colorado Douglas County Rueter-Hess Reservoir Precambrian supply produces hard water at 144.5 mg/L with TDS 356.5 mg/L.
Other Colorado Water Reports
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Frequently Asked Questions
Is Castle Pines North's water safe to drink?
Do I need a water softener in Castle Pines North?
How does Castle Pines North compare to the USA average?
Data Sources & Methodology
Water quality data for Castle Pines North is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.