La Presa Water Hardness & Quality Report (2026)
Water Hardness
2.8 grains per gallon
Source
mixed
pH Level
7.3
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
102.3 mg/L
Est. Daily Cost
$0.13
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 La Presa, your appliances are currently losing 6% efficiency due to mineral buildup.
| Appliance | In La Presa | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8 yrs | 8.5 yrs | -6% |
| Washing Machine | 11.8 yrs | 12 yrs | -2% |
| Water Heater | 13.7 yrs | 15 yrs | -9% |
Regional Water Comparison
How La Presa compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ La Presa, California | 48.5 mg/L | 3.2 ppt | 🟢 Soft | mixed |
| Spring Valley, California | 91.5 mg/L | 4.5 ppt | 🟡 Moderately Hard | mixed |
| Lemon Grove, California | 165.5 mg/L | 6.7 ppt | 🟠 Hard | mixed |
| Bonita, California | 177 mg/L | 7 ppt | 🟠 Hard | mixed |
| Casa de Oro-Mount Helix, California | 77.5 mg/L | 4.1 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How La Presa compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ La Presa | 48.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes La Presa's Water Unique?
Local geology and source profile
La Presa, California, an unincorporated community in San Diego County — a major east San Diego County community (La Presa is a significant unincorporated community in the Spring Valley–La Presa corridor of San Diego County — a primarily working-class and middle-class community adjacent to Spring Valley and El Cajon), a diverse San Diego County community with a significant Latino-American, Filipino-American, and Native American population (La Presa is near the Sycuan and Viejas Indian Reservations — major Native American communities in east San Diego County), and part of the growing east San Diego County suburban corridor — draws its municipal water supply via the Otay Water District or Spring Valley Water District. Water hardness in La Presa measures 48.5 mg/L — classified as very soft.
La Presa's very soft supply — surprisingly soft for San Diego County — reflects the SDCWA supply's effective softening in the east San Diego County La Presa distribution zone. The SDCWA supply at La Presa draws from the SWP Sierra Nevada snowmelt (calcareous-poor, approximately 30–60 mg/L) and Colorado River import (harder, approximately 280–320 mg/L). The La Presa zone receives a higher proportion of SWP supply with effective treatment, producing the very soft 48.5 mg/L.
With hardness at 48.5 mg/L, La Presa residents enjoy very soft water. Otay or Spring Valley Water District consistently delivers water meeting all California State Water Board and EPA Safe Drinking Water Act requirements.
Geology & Source: Mountain reservoir supply from the San Diego County Water Authority (SDCWA) import blend via the Otay Water District or Spring Valley Water District — the San Diego County east suburban San Diego corridor (SDCWA State Water Project (SWP) and Colorado River blend — the south San Diego County supply; effective softening in the La Presa–Spring Valley zone); very soft supply at 48.5 mg/L in San Diego County.