Crawl Space Waterproofing in Compton, California
4 of the 26 crawl space companies serving Compton, California specifically list waterproofing among their services, led by Surfacing And Waterproofing (5.0★, 55 reviews). Local waterproofing typically runs $1,450–$4,850.
Get drainage and sump pump quotes from Compton pros who handle wet crawl spaces. 4 local pros offer waterproofing services. For full service comparisons, see all crawl space contractors in Compton or encapsulation pros in Compton.
Compton Waterproofing Cost — Southwest — Monsoon + Flash Flood
Annual precipitation: 8–15 inches; 40–60% during monsoon (July–September).
Cost varies with crawl space perimeter, sump pump capacity, discharge length, and exterior grading work. Get 2–3 quotes for an exact number.
Why Waterproofing Matters in Compton
The Southwest is dry most of the year, so waterproofing here is event-driven rather than continuous. Monsoon thunderstorms can drop more rain in 30 minutes than the area normally sees in a month. Most homes do not need a full interior drain system — but they do need exterior grading, downspout management, and a vapor barrier. Homes near washes or in flood plains need full waterproofing.
What a Compton Waterproofing System Should Include
- ✓Vapor barrier (10–12 mil sufficient — low humidity year-round)
- ✓Exterior French drain along uphill side of property if grading is unfavorable
- ✓Extended downspouts (10+ feet) — monsoon bursts overwhelm short ones
- ✓Sump pump only if home is in a documented flood plain or near a wash
- ✓Hard-piped drain to a daylight outlet (most Southwest soils drain well)
- ✓Pest exclusion at all foundation penetrations
Interior vs Exterior Drainage in California
Recommendation
Most Southwest homes do NOT need interior perimeter drains. Exterior grading and downspout extensions handle 90% of moisture events. Reserve full systems for flood plain homes or those near washes.
Sump Pump Sizing
Skip the sump pump unless you are in a flood plain or near a wash. The dry climate means the pump rarely runs and seal degrades from disuse. If you do install one, prioritize a model rated for dry-cycle operation.
What to Watch For in California
- !Avoid contractors who push full interior drainage systems for non-flood-plain homes — likely overselling
- !In expansive-soil areas, exterior trench drains can crack as soils heave — check soil report first
- !Verify discharge daylight outlet is not on a neighbor's property (legal issue in the Southwest)
Waterproofing Contractors in Compton
Surfacing And Waterproofing
21304 Hart St, Canoga Park, CA 91303, USA
55 reviews
I AM Waterproofing Decks
4576 Tweedy Blvd, South Gate, CA 90280, USA
1 reviews
G&O Waterproofing
3305 W 21st St Apt 1, Los Angeles, CA 90018, USA
2 reviews
West Coast Decking & Waterproofing
15960 Downey Ave Suite A, Paramount, CA 90723, USA
41 reviews
Clean CrawlSpace Inc.
3100 Dutton Ave Ste. 142E, Santa Rosa, CA 95407, USA
60 reviews
PuroClean of Long Beach
800 W 14th St, Long Beach, CA 90813, USA
19 reviews
Loza Concrete Inc
2055 E 130th St, Compton, CA 90222, USA
1 reviews
ALL US Mold Removal & Remediation Huntington Park CA
6703 Santa Fe Ave, Huntington Park, CA 90255, USA
19 reviews
ALL US Mold Removal & Remediation Paramount CA
7300 Alondra Blvd #108, Paramount, CA 90723, USA
4 reviews
LA Flood Cleanup & Restoration
10212 Compton Ave, Watts, CA 90002, USA
25 reviews
Restorerz Emergency Services
1745 W 182nd St, Gardena, CA 90248, USA
482 reviews
SuperGreen Insulation
21601 Avalon Blvd #212, Carson, CA 90745, USA
23 reviews
Paramount Attic Insulations
15330 Texaco Ave, Paramount, CA 90723, USA
21 reviews
Clear Price Attic Insulation
1653 E 28th St #6, Signal Hill, CA 90755, USA
21 reviews
The Attic Insulation Specialists, Inc
10940 Wilshire Blvd, Los Angeles, CA 90024, USA
137 reviews
California Foundation Works
911 E 31st St Unit #A, Los Angeles, CA 90011, USA
18 reviews
Sunshine Foundation Repairs
18327 Napa St, Northridge, CA 91325, USA
432 reviews
Geobear Foundation Repair
22603 La Palma Ave, Yorba Linda, CA 92887, USA
46 reviews
Build Foundation Lynwood | Call Today
11245 Long Beach Blvd, Lynwood, CA 90262, USA
5 reviews
Professional Foundation Repair
7441 Anaconda Ave, Garden Grove, CA 92841, USA
221 reviews
Coastline Environmental Solutions - Mold Remediation Long Beach
2480 Brayton Ave, Signal Hill, CA 90755, USA
97 reviews
High Velocity Restoration Inc.
7314 E Petterson Ln, Paramount, CA 90723, USA
18 reviews
Foundation Repairs Paramount
8124 Alondra Blvd, Paramount, CA 90723, USA
0 reviews
Waterproofing FAQs — Compton, California
Which companies offer crawl space waterproofing in Compton?
Surfacing And Waterproofing (5.0★), I AM Waterproofing Decks (5.0★), G&O Waterproofing (5.0★) list waterproofing in Compton. 4 of 26 local crawl space companies tag this service directly.
How many crawl space contractors serve Compton?
26 crawl space companies are listed for Compton; Restorerz Emergency Services is the highest-rated at 5.0★ (482 reviews). Pros in nearby Los Angeles and San Diego also cover the area.
How much does crawl space waterproofing cost in Compton, California?
Crawl space waterproofing in Compton, California typically costs $1,450–$4,850 for a complete interior drainage system with sump pump. Southwest — Monsoon + Flash Flood pricing reflects local labor rates and the specific drainage scope each climate demands.
Do I need an interior or exterior drainage system in Compton?
Most Southwest homes do NOT need interior perimeter drains. Exterior grading and downspout extensions handle 90% of moisture events. Reserve full systems for flood plain homes or those near washes.
What size sump pump do I need in Compton?
Skip the sump pump unless you are in a flood plain or near a wash. The dry climate means the pump rarely runs and seal degrades from disuse. If you do install one, prioritize a model rated for dry-cycle operation.
Why is exterior grading important for waterproofing in California?
The most important fix in the Southwest. 6-inch fall over 10 feet. Verify after any monsoon — soil shifts more here than wetter regions. Many Southwest waterproofing problems resolve with grading alone.
When should I schedule waterproofing in Compton?
October through April — outside monsoon season and before extreme summer heat (above 100°F crawl space temps make work dangerous).
Expected ROI
Lower than wetter regions — typical payback is 7–12 years. Primary financial benefits: avoiding one monsoon-event interior flood ($5K–$15K) and improved indoor air quality (vapor barrier alone).
Best Season to Schedule
October through April — outside monsoon season and before extreme summer heat (above 100°F crawl space temps make work dangerous).
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Waterproofing Guides
Southwest — Monsoon + Flash Flood
Annual precipitation: 8–15 inches; 40–60% during monsoon (July–September)