Setting Up a Simple Rainwater Collection System for Your Mount Washington Hillside Garden

Living in Mount Washington means dealing with steep hillsides and seasonal rains. A simple rainwater collection system can capture thousands of gallons from your roof each year cutting your water bill and helping your drought-tolerant garden thrive. This guide covers the exact steps for setting up a system that works with your hillside terrain while meeting Los Angeles building codes.

Why Rainwater Harvesting Makes Sense in Mount Washington

Mount Washington gets about 14 inches of rain annually mostly falling between November and March. A 1,000 square foot roof can collect over 8,000 gallons in a typical season. With LADWP water rates climbing and drought restrictions tightening capturing this free water makes financial sense. The hillside location actually helps since gravity can assist with water pressure eliminating the need for electric pumps in basic setups. LADWP Rainwater Harvesting Rebates.

Choosing the Right System for Your Hillside Home

Three main options work well for Mount Washington properties. Rain barrels work for small gardens holding 50-100 gallons each. They cost $80-150 and install in under an hour. Cisterns store 200-5,000 gallons but need permits and professional installation. Gravity-fed systems use your slope to create pressure feeding drip lines directly to plants without pumps.

Most hillside homes benefit from a hybrid approach. Place rain barrels near downspouts for immediate use then connect to a small cistern at the base of the hill for storage. This setup handles both the steep terrain and LA’s sporadic rainfall patterns.

Mount Washington Specific Installation Considerations

The clay soil common in Mount Washington expands when wet creating pressure on buried pipes. Use flexible connectors at all joints to prevent cracking. The steep grades mean water flows faster so install first-flush diverters to catch debris before it enters your storage. Position overflow outlets away from your foundation since heavy rains can create erosion on exposed hillsides.

Local wildlife including raccoons and squirrels can chew through standard mesh screens. Upgrade to stainless steel hardware cloth with openings smaller than 1/8 inch. The marine layer in Mount Washington keeps surfaces damp longer increasing algae growth. Use opaque containers and add a small amount of hydrogen peroxide monthly to keep water clear.

Navigating Los Angeles Building Codes and Permits

The California Plumbing Code requires permits for cisterns over 200 gallons. LADBS classifies rainwater systems as non-potable water storage meaning they cannot connect to household plumbing without additional backflow prevention. First-flush diverters must divert at least 0.5 gallons per 100 square feet of roof area according to Title 10 of the LA Municipal Code. California Environmental Protection Agency Water Programs.

Mount Washington’s hillside overlay zone adds requirements. Any system visible from public right-of-way needs architectural approval from the Mount Washington Association. Storage tanks must be anchored to resist sliding on slopes over 15 degrees. Check LADWP’s current rebate program before starting since requirements change yearly.

Step-by-Step Installation Process

Rebates and Financial Incentives in Los Angeles

LADWP offers $35 per barrel up to 4 barrels per property through their residential rain barrel program. The Metropolitan Water District adds $75 per barrel bringing total savings to $110 per barrel. For larger cisterns check SoCal WaterSmart which provides $2 per gallon of storage capacity up to $2,000.

Mount Washington residents can also access LADWP’s Landscape Incentive Program which pays $3 per square foot to replace grass with drought-tolerant plants. Combine this with rainwater harvesting to maximize savings. Keep all receipts and submit applications within 180 days of purchase.

Maintenance Schedule for LA’s Mediterranean Climate

Clean gutters and downspouts quarterly especially after the Santa Ana winds in fall. Check first-flush diverters monthly removing sediment buildup. Inspect storage tanks for cracks before the rainy season starts in October. Mount Washington’s hillside location means debris accumulates faster than in flat areas. Plumbing Santa Clarita.

Test water quality annually using a simple garden test kit checking pH and nitrogen levels. If you notice algae growth increase screening or add a small UV clarifier. Drain and clean tanks every 2-3 years or more often if you notice sediment buildup affecting flow rates.

Common Mistakes to Avoid

Underestimating overflow capacity causes the most failures in Mount Washington. A single inch of rain on a 2,000 square foot roof produces over 1,000 gallons. Without proper overflow you risk tank rupture or foundation damage. Another mistake is using undersized piping. Stick with 3/4 inch minimum for main lines even if current demand seems low.

Ignoring mosquito control leads to vector complaints from neighbors. LADPH requires all standing water containers to have proper screening. Using clear containers accelerates algae growth. Mount Washington’s sunny slopes can heat water to 90+ degrees creating ideal conditions for bacteria if not properly managed.

Integrating with Your Existing Garden

Mount Washington’s hillside gardens often feature native plants like California lilac and manzanita that thrive on intermittent watering. Use drip emitters delivering 0.5-2 gallons per hour matching these plants’ natural rainfall patterns. Group plants with similar water needs creating hydrozones that maximize your harvested water.

Consider adding a small pump if your garden sits above your storage. A 12-volt DC pump powered by a solar panel can push water uphill without increasing your electric bill. This setup works well for raised beds common in Mount Washington’s terraced yards.

Safety and Environmental Considerations

Never use rainwater from roofs with asbestos shingles or those treated with moss killers. Mount Washington’s older homes may have lead flashing which leaches into water. Test your roof material before investing in a large system. The California Department of Public Health provides free testing kits for concerned homeowners.

Position storage tanks to prevent tipping during earthquakes. Mount Washington sits near the Elysian Park Fault so anchor systems using seismic straps rated for your tank’s weight when full. Over 1,000 pounds for a 150 gallon barrel. Consider installing an automatic shutoff valve that activates during tremors.

Getting Professional Help in Mount Washington

DIY installation works for simple barrel systems but hillside properties often need professional assessment. A licensed plumber familiar with LADBS codes can identify potential code violations before you start. They can also integrate your rainwater system with existing irrigation saving you from digging up established landscaping.

Look for contractors with ARCSA (American Rainwater Catchment Systems Association) certification. They understand the specific challenges of LA’s microclimates including Mount Washington’s marine layer and seasonal winds. Ask for references from other hillside properties since flat-land experience doesn’t always translate to sloped terrain. American Rainwater Catchment Systems Association.

Frequently Asked Questions

How much does a basic rainwater system cost in Mount Washington?

A simple barrel setup costs $200-400 including materials and basic tools. Professional installation adds $300-500. Larger cistern systems range from $1,500-5,000 depending on size and complexity. Factor in $100-200 annually for maintenance supplies.

Can I use rainwater for indoor purposes?

California Plumbing Code prohibits using rainwater indoors without extensive treatment and permits. Systems must remain separate from potable water lines. Some homeowners install secondary plumbing for toilet flushing but this requires permits and backflow prevention devices. Plumbing Glendale.

How long can I store rainwater before it goes bad?

Properly stored rainwater stays fresh for 6-12 months. Use opaque containers kept below 70 degrees Fahrenheit. Add a small amount of chlorine bleach (1/4 teaspoon per 100 gallons) if storing longer than 3 months. Test water if you notice odor or discoloration.

Ready to Start Harvesting?

Mount Washington’s unique hillside environment makes rainwater harvesting both challenging and rewarding. With proper planning you can capture thousands of gallons annually reducing your water bill while supporting your garden through dry months. The combination of LADWP rebates and water savings often pays for the system within 2-3 years.

Call (213) 449-7577 today to schedule your inspection. Our team understands Mount Washington’s specific building codes and hillside challenges. We’ll help you design a system that maximizes your collection potential while staying compliant with all local regulations. Don’t wait until the next rainy season starts.

Additional Resources for Mount Washington Residents

The LADWP Rainwater Harvesting page provides current rebate amounts and application forms. The Mount Washington Association offers guidelines for visible installations on hillside properties. For technical specifications the American Rainwater Catchment Systems Association maintains a database of approved components and design standards.

Local suppliers like ProPlumb in nearby Cypress Park stock LA-specific components including first-flush diverters sized for our rainfall patterns. They also offer workshops each fall before the rainy season helping homeowners prepare their systems.

Remember that every gallon you harvest is a gallon you don’t have to buy from LADWP. In Mount Washington where water often needs pumping uphill to reach your garden the savings add up quickly. Start small with a couple of barrels and expand as you see the benefits.

You may also find this helpful. Protecting Your Altadena Outdoor Faucets From the Occasional Winter Freeze.

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