Aliso Viejo Water Hardness & Quality Report (2026)
Water Hardness
4.2 grains per gallon
Source
mixed
pH Level
7.5
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
166.1 mg/L
Est. Daily Cost
$0.19
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 Aliso Viejo, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Aliso Viejo | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.2 yrs | 8.5 yrs | -15% |
| Washing Machine | 10.9 yrs | 12 yrs | -9% |
| Water Heater | 12.7 yrs | 15 yrs | -15% |
Regional Water Comparison
How Aliso Viejo compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Aliso Viejo, California | 72.5 mg/L | 4 ppt | 🟡 Moderately Hard | mixed |
| Laguna Woods, California | 67.5 mg/L | 3.8 ppt | 🟡 Moderately Hard | mixed |
| Laguna Niguel, California | 65 mg/L | 3.7 ppt | 🟡 Moderately Hard | mixed |
| Laguna Hills, California | 63.5 mg/L | 3.7 ppt | 🟡 Moderately Hard | mixed |
| Laguna Beach, California | 61.5 mg/L | 3.6 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Aliso Viejo compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Aliso Viejo | 72.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Aliso Viejo's Water Unique?
Local geology and source profile
Aliso Viejo, California, in south Orange County — a major master-planned community and one of the last cities incorporated in California (2001), known for its extensive trail system in the Aliso and Wood Canyons Wilderness Park, the Soka University of America campus, and a major tech corridor with Accenture, Quest Software, and Allergan offices — draws its municipal water supply from Metropolitan Water District (MWD) imports via the Moulton Niguel Water District (MNWD). Water hardness in Aliso Viejo measures 72.5 mg/L — classified as moderately soft.
Aliso Viejo's moderate softness — dramatically below the MWD import hardness (270–310 mg/L) — reflects the MNWD's advanced water treatment and infrastructure. MNWD is one of Orange County's most modern water agencies, serving a purpose-built planned community corridor (Aliso Viejo, Laguna Hills, Laguna Niguel, Mission Viejo, Dana Point). MNWD applies advanced lime-softening and reverse osmosis blending through its modern water treatment plants, dramatically reducing the hard MWD Colorado River import. The MNWD system's exceptionally modern distribution infrastructure (installed primarily in the 1980s–2000s) contributes minimal additional hardness, producing the moderate 72.5 mg/L — far below comparable import-dependent communities.
With hardness at 72.5 mg/L, Aliso Viejo residents enjoy moderately soft water for a Southern California community. Moulton Niguel Water District consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from the Moulton Niguel Water District (MNWD) — Metropolitan Water District (MWD) import and local Santiago Peak Formation groundwater via the Moulton Niguel Water District — the Orange County South County San Juan–Aliso Creek watershed (MWD Colorado River and Bay-Delta import + local Aliso Creek drainage); moderately soft supply at 72.5 mg/L — reflecting the MNWD's advanced treatment and blending in the south Orange County zone.