Laguna Niguel Water Hardness & Quality Report (2026)
Water Hardness
3.8 grains per gallon
Source
mixed
pH Level
7.4
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
145.3 mg/L
Est. Daily Cost
$0.17
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 Laguna Niguel, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Laguna Niguel | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.5 yrs | 8.5 yrs | -12% |
| Washing Machine | 11.2 yrs | 12 yrs | -7% |
| Water Heater | 13 yrs | 15 yrs | -13% |
Regional Water Comparison
How Laguna Niguel compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Laguna Niguel, California | 65 mg/L | 3.7 ppt | 🟡 Moderately Hard | mixed |
| Aliso Viejo, California | 72.5 mg/L | 4 ppt | 🟡 Moderately Hard | mixed |
| San Juan Capistrano, California | 34 mg/L | 2.8 ppt | 🟢 Soft | mixed |
| Dana Point, California | 89 mg/L | 4.4 ppt | 🟡 Moderately Hard | mixed |
| Laguna Beach, California | 61.5 mg/L | 3.6 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Laguna Niguel compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Laguna Niguel | 65 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Laguna Niguel's Water Unique?
Local geology and source profile
Laguna Niguel, California, in south Orange County above Laguna Beach on the coastal foothills of the Santa Ana Mountains — one of Orange County's most affluent cities, consistently ranking among the best places to live in the US — draws its municipal water supply through the City of Laguna Niguel Public Works Water Division, sourcing from the Municipal Water District of Orange County (MWDOC) which delivers a blend of Metropolitan Water District of Southern California (MWD) imported water from the Colorado River Aqueduct and the State Water Project (SWP). Water hardness in Laguna Niguel measures 65 mg/L — classified as moderately soft.
Laguna Niguel's moderately soft supply reflects the south Orange County MWDOC distribution zone's favorable supply blend characteristics. The south Orange County cities (Laguna Niguel, Aliso Viejo, Mission Viejo area) are in an MWDOC zone that receives a higher proportion of the soft State Water Project Sacramento–Feather River import (SWP source hardness 20–50 mg/L from the Sierra Nevada granodiorite watershed) compared to the Colorado River supply (very hard, 300–600 mg/L raw). The SWP water dominates the south Orange County blend, producing the 65 mg/L moderate softness — a stark contrast to the very hard supplies of inland San Bernardino and Riverside Counties dependent on more Colorado River water.
With hardness at 65 mg/L, Laguna Niguel residents enjoy moderately soft water with minimal scale challenges. City of Laguna Niguel Public Works and MWDOC consistently deliver water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from Municipal Water District of Orange County (MWDOC) — Metropolitan Water District (MWD) imports (Colorado River Aqueduct and State Water Project) via the City of Laguna Niguel Public Works Water Division — the south Orange County coastal hills distribution zone; moderately soft supply at 65 mg/L — reflecting a higher SWP blend in the south Orange County MWDOC distribution.