If your pool has high calcium, high CYA, or high salt, you’ve probably been told to drain and refill your pool.

But what most homeowners don’t realize is that draining a pool in San Diego can cost far more than expected — and in many cases, there’s a better option.

Average Cost to Drain a Pool in San Diego

The cost to drain and refill a pool depends on your pool size, water rates, and sewer charges.

Here’s what most homeowners can expect:

• Water cost: $150 – $400+
• Sewer charges (if applicable): $200 – $800+
• Professional draining service (optional): $150 – $500
• Chemicals to rebalance water: $100 – $300

Total typical cost: $500 – $1,500+

For larger pools or properties with higher sewer rates, costs can easily exceed $1,500.

Hidden Costs Most Pool Owners Don’t Consider

1. Risk of Structural Damage

Draining a pool removes the weight that helps hold it in place. In areas with groundwater pressure, this can lead to cracking, shifting, or even a “pop-up.”

👉 Learn more about the risks here:

Why Draining Your Pool Can Damage Your Pool

2. Plaster Damage and Wear

Empty pools exposed to sun and heat can experience:

• Cracking
• Delamination
• Surface deterioration

This can shorten the lifespan of your pool finish and lead to costly repairs.

3. Water Waste

Draining a pool typically wastes 15,000–30,000 gallons of water.

In California, where water conservation is a major concern, this is both environmentally and financially costly.

Why Draining Doesn’t Fully Solve the Problem

Even after draining, many pool owners see issues return faster than expected.

That’s because:

• Calcium can leach from plaster
• CYA can build up again quickly
• Tap water already contains minerals

In many cases, draining becomes a cycle — not a long-term solution.

The Alternative: Pool Reverse Osmosis

Instead of draining your pool, reverse osmosis purification allows you to clean your existing water.

This process removes:

• Calcium hardness
• Cyanuric acid (CYA)
• Salt
• Total dissolved solids (TDS)
• Phosphates and contaminants

All while keeping the water in your pool.

If you’re in San Diego County or Orange County, mobile reverse osmosis can restore your pool without draining it.

Cost Comparison: Draining vs Reverse Osmosis

Which Option Is Better?

If your goal is to reset your water safely and efficiently, reverse osmosis is often the better long-term solution.

• No draining required
• No structural risk
• Major water savings
• Longer-lasting water quality improvements

Get a Professional Recommendation

Every pool is different. The best way to know whether you should drain or purify your water is to test it.

Portside Pool Purification

Mobile Pool Reverse Osmosis Service

Serving San Diego and Orange County