A green pool in Phoenix usually did not get that way overnight. A pump timer got knocked out by a storm, a house sat empty through the summer, a renter moved out, or the chlorine simply could not keep up with the heat for a couple of weeks. Whatever the reason, the job now is the same: get the water clear and safe again, and keep it from becoming a mosquito nursery for the whole street. This page explains what a green pool cleanup involves, how the Valley's county mosquito program treats green pools, and what to ask before you hire someone.
Phoenix Pool Cleaning Pro is not a pool company. It is a free phone line. Call (623) 240-0428 and an automated assistant answers, asks what the pool looks like, and transfers you to an independent, locally owned pool service company in the Phoenix area. That company comes out, sees the pool, quotes the cleanup and does the work. You pay the company, not the line.
Safety first: a green pool is a drowning hazard
The color is the least of the problems. The bigger one is that nobody can see what is under the surface.
Keep children and pets out
The CDC reports that drowning is the leading cause of death for children ages 1 to 4 in the United States, and that most of those deaths happen in swimming pools. A child who slips into murky water disappears from view at once. Lock gates, keep doors to the yard closed, and never leave a child near the water alone, even for a minute.
Nobody swims until it is clear
CDC guidance is simple: if you cannot see the drain at the bottom of the deep end, stay out. Cloudy water can also mean more germs than usual. Wait until the water is clear and a test shows chlorine and pH back in a normal range, not just when it turns a lighter green.
Leave the chemicals to the professional
Clearing a green pool takes heavy doses of chlorine. Never mix pool chemicals with each other, never add anything from two containers at once, and store what you have apart, dry, shaded and out of children's reach. The shock treatment is the pool company's job.
Fence on all four sides
The CDC says a four-sided isolation fence, one that separates the pool from both the house and the yard, cuts a child's drowning risk by 83 percent compared with fencing only around the property line. If the pool is green because the house is empty, check that the gate still latches.
What a green pool cleanup in Phoenix involves
A cleanup is not a single bucket of shock. The algae has to be killed, the dead algae has to be pulled out of the water, and the system that should have stopped it has to work again. A careful pool technician usually works through these stages, though every pool is a little different:
- Look before touching anything. The technician checks whether the pump runs, whether the filter is clogged or damaged, and whether the timer or automation is set. If the equipment caused the problem, chemicals alone will not fix it.
- Pull out the debris. Leaves, palm fronds, monsoon dust and anything else sitting in the water come out with nets and the vacuum. Debris uses up chlorine and gives algae a place to hide.
- Test the water. Chlorine, pH and stabilizer (cyanuric acid, the chemical that shields chlorine from sunlight) are measured so the treatment fits the pool. Too much stabilizer slows chlorine down, and the CDC notes that it lowers how well chlorine disinfects.
- Heavy chlorination. The professional raises the chlorine far above everyday levels to kill the algae. This is the step to leave alone: the doses are strong and the products must never be mixed.
- Brush every surface. Algae clings to walls, steps and corners. Brushing breaks it loose so the chlorine reaches it. Michigan State University's pool manual notes that black and yellow algae have a tough outer layer that resists chemicals, and black algae needs a stainless steel brush.
- Filter around the clock. Dead algae turns the water gray or cloudy before it clears. The pump runs continuously so the filter can catch it, and the filter often clogs quickly during this stage.
- Clean the filter, sometimes more than once. A cartridge or grid filter loaded with dead algae stops working. Expect it to be cleaned or backwashed during the cleanup, and replaced if it is torn or worn out.
- Retest and rebalance. Once the water is clear, chlorine and pH are brought back into a normal range. The CDC recommends a pH of 7.0 to 7.8 and at least 1 ppm of free chlorine in a home pool.
When part of the water has to go
Sometimes the water itself is the problem. If the stabilizer has built up so high that chlorine can barely work, or the pool sat so long that the bottom is a layer of sludge, the company may recommend draining part of the pool and refilling with fresh water. That decision should come from test results, not guesswork, and it comes with city rules on where the water may go. The guide to draining a pool in Arizona covers those.
A full drain is a bigger step with its own risks, so ask why it is needed and what the alternatives are before you agree.
How long a green pool cleanup takes
There is no honest one-size answer. The things that set the timeline are easy to understand, though, and worth asking about when the company quotes:
| Factor | Faster cleanup | Slower cleanup |
|---|---|---|
| How long it sat | Turned green in the last week or two | Sat for months, sludge on the floor |
| Type of algae | Free-floating green algae | Yellow (mustard) or black algae clinging to plaster |
| Equipment | Pump and filter run normally | Pump will not start, filter torn or clogged |
| Stabilizer level | In a normal range | Built up so high that chlorine works slowly |
| Debris | A few leaves | A monsoon's worth of dust, fronds and trash |
Most cleanups need more than one visit: a first visit for debris, testing, chlorination and brushing, then follow-up visits to brush again, clean the filter and retest. Ask how many visits the price covers and what happens if the water is not clear by the last one.
Green pools, mosquitoes and Maricopa County
In the Valley, a green pool is a public health issue as well as a private one. Mosquitoes lay eggs on still water, and the CDC lists unmaintained swimming pools among the places Culex mosquitoes like to breed. The CDC puts their trip from egg to adult at about 7 to 10 days. One neglected backyard can supply mosquitoes for a whole block.
Maricopa County's Environmental Health Code addresses this directly. Chapter 3 says no one may cause, keep or allow standing water where mosquitoes breed or are likely to breed, and that the owner, occupant or person in control of the site must remove the breeding and keep it from coming back. That covers a backyard pool like any other standing water.
How a green pool report works
The county's Environmental Services Department receives and responds to complaints about green pools every year, and its Vector Control specialists contact property owners to make sure the pools are dealt with. You can file a complaint online through the county's Vector Control page or call (602) 506-6616. County staff investigate complaints in the order they are received.
What helps while you wait
- Keep the pump running and the water moving. Still water is what mosquitoes need, so keep the pump and filter on their normal schedule and keep chlorine in the water while you wait for the cleanup.
- Ask about mosquito fish. The county's Vector Control page lists mosquito-eating fish (Gambusia) as free of charge. Call (602) 506-0700 on a weekday to check whether they are available.
- Empty other standing water. Buckets, pool cover puddles and plant saucers can breed mosquitoes too.
Vacant, bank-owned and rental homes
Many green pools in the Phoenix area belong to houses with nobody living in them: a home waiting to sell, a bank-owned property, a rental between tenants or a snowbird's house over the summer. A pump timer knocked off its schedule, or an automation system nobody checks, can let a clear pool turn while nobody is looking, and summer heat speeds algae along.
If you are the owner, the agent or the property manager, three things help. First, get the pool cleaned before showings or move-in, since buyers and tenants see a green pool as a sign of bigger problems. Second, make sure someone checks the pump, the timer and the gate latch on a schedule while the house sits. Third, if the county has already contacted you, keep a copy of the notice and the cleanup invoice. Neighbors of an empty house with a green pool can use the county complaint process above; the line cannot report a pool for you.
Monsoon season makes it worse. The National Weather Service treats June 15 through September 30 as the monsoon season in Arizona. Dust storms and downpours dump dirt and debris into pools and can knock out power to the equipment. An empty house can go from clear to green in that window without anyone noticing.
What a green pool cleanup costs
This line does not quote or set prices. For a published reference point, HomeGuide estimates $300 to $500 for the first cleaning to bring a green pool back to life, then about $100 to $150 a month for regular upkeep, and says the price depends on the pool's size and type and on whether it is a saltwater pool. HomeGuide puts a first-time cleaning of a neglected pool at $150 to $350 on average. Those are published national figures, not prices from this line, and real quotes in the Valley vary.
What pushes a quote up: a pool that sat for months, black or mustard algae, a filter that needs replacing instead of cleaning, a pump that needs repair before the cleanup can start, a partial drain, and extra follow-up visits. Ask for a written quote that lists the visits included and anything that would cost more, such as filter parts or equipment work.
Pool green, cloudy or full of debris? Call the line, describe what you see and which part of the Valley you are in, and you will be put through to a local pool service company that can look at it and give you its own price.
What to ask the company before the cleanup starts
- What caused it? If the pump, filter or timer failed, the cleanup will not last unless that gets fixed too.
- How many visits does the price include? And what happens if the water is not clear at the end.
- Will part of the water need to go? If so, why, and where will the water be discharged.
- What is the filter's condition? Cleaning, a new cartridge or a filter repair are different costs.
- What happens after? A pool that just cleared needs steady care for a few weeks. Ask about weekly cleaning and maintenance.
- Who is doing any repair work? Pump, filter and equipment repairs generally call for a licensed contractor in Arizona. Whether a cleaning-only service needs a license is not spelled out, so if it matters to you, ask the Registrar of Contractors.
Check the license first. Arizona's Registrar of Contractors (ROC) licenses contractors, and its residential classifications include R-6, Swimming Pool Service and Repair. Repairs, equipment replacement and resurfacing generally call for a licensed contractor; whether a cleaning-only service needs a license is not spelled out, so ask the ROC if it matters to you. Ask the company for its ROC license number and look it up on the ROC contractor search (opens in a new tab) before work begins. The line does not check this for you.
If you want to understand why the pool turned in the first place, the why is my pool green guide walks through chlorine, stabilizer, phosphates and circulation in desert heat. If the pump or filter is the cause, see pool pump repair and pool filter cleaning.
- Call the numberAn automated assistant answers (623) 240-0428 day or night, weekends included.
- Describe the poolSay what is going on: cloudy or green water, a pump that hums, a heater that will not fire, scale on the tile, and which part of the Valley you are in.
- Get put throughThe call is transferred to an independent, locally owned pool service company, which hears a short summary of the problem before it picks up.
- Deal with them directlyThat company looks at the pool, quotes, does the work and bills you. If it cannot answer, your name, number, area and problem are passed along so it can call you back.
About this line: Phoenix Pool Cleaning Pro is a free phone line, not a pool company. It answers your call and connects you with an independent local pool service company, which inspects, quotes and does the work, and which you pay directly. Companies may pay a referral fee. You never pay the line. See how the line works.