San Juan Capistrano Water Hardness & Quality Report (2026)
Water Hardness
2 grains per gallon
Source
mixed
pH Level
7.2
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
68.4 mg/L
Est. Daily Cost
$0.09
energy & soap waste
Source: USGS Water Quality Portal · 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 San Juan Capistrano, your appliances are currently losing 5% efficiency due to mineral buildup.
| Appliance | In San Juan Capistrano | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.5 yrs | 8.5 yrs | — |
| Washing Machine | 12.3 yrs | 12 yrs | — |
| Water Heater | 14.2 yrs | 15 yrs | -5% |
Regional Water Comparison
How San Juan Capistrano compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ San Juan Capistrano, California | 34 mg/L | 2.8 ppt | 🟢 Soft | mixed |
| Laguna Niguel, California | 65 mg/L | 3.7 ppt | 🟡 Moderately Hard | mixed |
| Dana Point, California | 89 mg/L | 4.4 ppt | 🟡 Moderately Hard | mixed |
| Ladera Ranch, California | 56.5 mg/L | 3.5 ppt | 🟢 Soft | mixed |
| San Clemente, California | 171 mg/L | 6.8 ppt | 🟠 Hard | mixed |
National Benchmark
How San Juan Capistrano compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ San Juan Capistrano | 34 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your San Juan Capistrano home
Shop water softeners on Amazon.com →
What Makes San Juan Capistrano's Water Unique?
Local geology and source profile
San Juan Capistrano, California, in Orange County — a historic south Orange County mission city (San Juan Capistrano is home of the Mission San Juan Capistrano — founded in 1776 by Junipero Serra, one of the oldest and most famous California missions, known for the Return of the Cliff Swallows, celebrated as St. Joseph's Day when swallows return from their winter migration), one of the best-preserved historic mission communities in California, adjacent to Dana Point on the Orange County coast, home of the earliest European settlement in Orange County, and a diverse Orange County community balancing historic preservation and rapid growth — draws its municipal water supply from the Oso Creek groundwater basin and MWD import via the Santa Margarita Water District. Water hardness in San Juan Capistrano measures 34 mg/L — classified as very soft.
San Juan Capistrano's very soft supply reflects the SMWD Metropolitan Water District import and local groundwater blend's calcareous-poor characteristics. The MWD import (the State Water Project — primarily Sierra Nevada snowmelt via the California Aqueduct) is exceptionally soft (approximately 30–50 mg/L). The local Oso Creek alluvial groundwater in the San Juan Creek Valley is also calcareous-poor. The SMWD blend produces the very soft 34 mg/L.
With hardness at 34 mg/L, San Juan Capistrano residents enjoy very soft water. Santa Margarita Water District consistently delivers water meeting all California State Water Board and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Oso Creek groundwater basin and Metropolitan Water District (MWD) import via the Santa Margarita Water District (SMWD) — the Orange County south coastal California San Juan Creek Valley (Quaternary calcareous-poor San Juan Creek alluvial deposits and MWD State Water Project import — the calcareous-poor Sierra Nevada snowmelt blend; SMWD south Orange County distribution); very soft supply at 34 mg/L in Orange County.