Filling a Pool with Well Water [Made Easy!]


This article covers everything that pool owners should be aware of the considerations when using well water to fill their pool.

In general, filling a swimming pool using well water is acceptable. However, the suitability of well water as a source to fill up a pool may rely on the quantity and quality of the well water.

Is it OK to use well water in a pool?

While using well water to fill a pool is generally considered safe, it’s important to note that well water usually contains contaminants such as arsenic, iron, hydrogen sulfide, hardness minerals, and manganese, which can impact the quality of the pool water.

These impurities can lead to discoloration of the pool water, tiles, and equipment, as well as promote the growth of harmful bacteria.

It’s essential to test the well water for these contaminants and take appropriate measures to treat it before filling the pool to avoid any issues.

Your well water will probably need to be filtered and treated in order for it to be used in a swimming pool.

While using well water to fill a pool is generally safe, it is important to note that the water often contains contaminants that can negatively affect the quality of the pool water.

These impurities can cause discoloration, damage to equipment, and even the spread of bacteria. Therefore, it is necessary to work on the well water before using it in a pool.

How to Assess if Your Well Can Adequately Fill Your Swimming Pool

Consider these factors before utilizing well water to fill the pool:

The rate at which water flows from the well

The flow rate of your well unit will determine if it can supply sufficient water for your pool. With pools requiring numerous gallons of water, an insufficient well may not be able to provide enough.

The flow rate of your well refers to the volume of water that the well pump is able to extract from the aquifer every hour, measured in gallons.

A high flow rate is achieved if more than six hundred gallons per hour can be generated by your well, while a low flow rate is indicated by less than a hundred and fifty GPG.

In this situation, it is preferable to have a higher well flow rate. Wells with a slow flow are vulnerable to running dry while filling the pool, whereas wells with a fast flow rate allow for a quick and easy pool filling process.

To share a groundwater table or not to

If you allow your neighbors to access your well water, it’s likely that the rate of flow of your well will be reduced.

It’s important to consider that utilizing well water directly for your pool can affect the quantity and rate of water flow that your neighbors are able to receive, particularly if it causes the well at your property to run dry.

Impact of seasons

During the summer months, it is essential to take into account the potential for drought and arid conditions in your region if you intend to fill the pool.

During a drought, your well’s flow rate is probably going to be lower and may not provide enough water to fill the pool.

It’s important to consider whether it is worthy of using your limited well water supply to fill your pool since if you use up all the water during a drought, you may not have access to any water for the rest of the summer.

The Existence of Metals and Pollutants

As it travels through various layers of rock and soil, well water tends to accumulate minerals and metals, which eventually end up in your aquifer.

For instance, certain minerals and metals can discolor your pool’s tiles, clog the pipes and filters, and even lead to bacterial growth in the presence of too much iron.

Additionally, some minerals/metals can stain the hair of swimmers and turn the water an unattractive shade of brown or green.

To avoid these issues, it is recommended that you treat and filter your well water before using it to fill the swimming pool.

Doing so can help eliminate harmful pollutants and ensure that your pool water remains clean, clear, and safe for swimming throughout the summer months.

Equipment for swimming pools

Because well water contains various ions, your pool’s pumps as well as filters must work extra hard to provide the intended effects.

As a result, the pool pump as well as the filtration system will deteriorate more quickly compared to when you utilized municipal tap water or a water supply service.

If you opt for using unfiltered well water for your pool, be ready to substitute your pool equipment at a higher frequency than usual if you use other water sources.

Excessive amounts of manganese and iron will also harm the pool liner and reduce its lifespan. When you decide to use well water in the pool, make sure you can afford the upkeep.

Usage of Water

In order to prevent the depletion of your well water, it is essential to take into account the number of people in your household, the number of restrooms, and how often you use water-intensive appliances like dishwashers and washing machines.

If your water consumption already exceeds the standard, it is not recommended to fill one’s pool with large amounts of well water, as this could further deplete your supply.

The Advantages and Disadvantages


Reduces costs

Filling a pool with well water can save you money since it is a free resource.

By using well water to fill your swimming pool, you can avoid paying a substantial water bill regardless of the pool’s size, as long as your well is capable of providing an adequate amount of water with a suitable flow rate.

No meter is used for well water

Well water is not metered, in contrast to municipal water. This implies that you can utilize a customizable water supply for your swimming pool water without being anxious about the expense.


You don’t need to pay a professional or exhaust too much time working it out. Utilizing water from an independent well is a wonderful alternative for pool owners searching for a quick fix when it comes to filling their pools with water.


You could dry up your well

Based on the capacity of your well and the present weather conditions, using well water to fill a large swimming pool could result in your well drying up. If you’re filling a big pool/your well supply volume isn’t particularly high, this is very likely to happen.


Well water can only be used to fill the pool slowly. If your well is capable of producing 540 GPH, it may take about 7 hours to fill a 4,000-gallon swimming pool. Some of the swimming pools have a capacity of 10 to 20 thousand gallons, which necessitates a longer filling process.

Pre-Treatment Is Necessary

Well water frequently has significant concentrations of pollutants such as iron, hardness minerals, and trace metals that are found in much lower concentrations of city water.

A water filter system will probably be necessary to clean the city water then only you can utilize it in the pool.

Your utilization of the water supply may affect the water access of your neighbors.

It’s likely that you and a few neighbors share a water table. You can wind up reducing your neighbors’ access to pool water if you fill your pool with hundreds of gallons of well water.

Suggestions for Preparation of Filling Pool with Well Water

Employ Water Testing

It is advisable to perform a water analysis before utilizing your well water to fill the pool.

By conducting a water test, you can obtain valuable information about the water quality, such as its levels of metals, minerals, chemicals, and microorganisms.

Conducting a water test can help you determine whether it is necessary to filter your water in order to remove impurities before using it to fill your pool.

Give a Pool Supply Store water specimen

As an optional step, you may consider taking a specimen of the well water for a local pool business for testing.

Although you may need to spend money on it, the retail expert can determine if the water is suitable for pool usage and if filtration is necessary. Don’t forget to request water testing at the pool business.

Set up a system for treating water

If you haven’t installed one yet, consider setting up a water treatment system to get rid of iron, and calcium hardness, or to adjust the pH level of water.

Water softeners and whole-home filtration systems can eliminate pollutants that harm pool components and cause discoloration on the walls.

Additionally, these filters can enhance the overall quality of your water system as well as tap and shower water, since they are installed where the water line enters your home.

Instructions for Adding Well Water to Swimming Pool

Filling your pool with well water, you’ll need an external tap and a garden hose. This procedure will need a few days to get it done.

Begin by attaching the garden hose to a nearby outdoor tap that’s near the pool. Don’t attach it to a household faucet.

Dangle the hose’s open end into the pool and ensure that it is weighted down to keep the head submerged inside the pool.

Next, turn on the outdoor/indoor faucet in order to start the water flow into the pool via the hose. One should wait until the pool is filled. It may take about a full day for a small pool to fill up and 48 hours for a large pool.

Lastly, turn off any indoor or outdoor faucets.

Treating a Swimming Pool Water with Well Water: Tips and Guidelines

After filling your pool with well water, it is important to take into account some water treatment procedures to ensure the quality of your water:

Check your pH and free chlorine levels

Utilize a pool water test kit that may be done at home.

Adapt the free chlorine levels in your water

To increase chlorine levels, use pool water chlorine; to decrease levels, try a granular chlorine neutralizer.

Adapt the pH of your water

You can raise the pH of your water using soda ash or lower it using muriatic acid.

Change the alkalinity of your water

To raise alkalinity, add sodium bicarbonate; to decrease alkalinity, use muriatic acid.

Metal reduction

Remove the rust from your pool water by vacuuming it out and dissolving metals using a chelating solution.

Frequently Asked Questions

Can you link your pool and well directly?

It is possible to fill your pool with well water that has not been treated by directly connecting it to your well. However, if your well water is hard, hazy, or contaminated, it may harm the pool without prior treatment.

Therefore, it is recommended to purify your well water and then only add it to the pool. You can use a sand filter or a water softener for this purpose.

How much time is needed to use a well to fill a pool?

A smaller pool can be filled in approximately 24 hours, while a large pool can be filled in around 48 hours. The time it will take to fill the pool depends on both its size and the rate at which water flows from your well.

To prevent the pool water from overflowing, be careful to monitor the filling process.

How should you proceed after introducing well water into your swimming pool?

Test your water’s pH, alkalinity as well and chlorine levels after you’ve filled your pool with well water, and make any required adjustments. Incorporate pool chemicals into your water as directed by the manufacturer.

Can your pool turn green from well water?

Indeed, your pool may become green with well water. This happens if metals in the well water, such copper, undergo oxidation in the water. Your pool will acquire a green hue as a result. Metals are not harmful, but you may eliminate them with an appropriate water filter in order to avoid stains on your pool’s sides.

How long should my well be running to fill up a pool?

To fill a pool, it’s best to operate your well not exceeding 6-8 hours each day. By doing this, you’ll stop the well from getting too much use and dehydration.

The size and flow rate of one’s well determines the precise running duration that is appropriate for it.

Can a pool be filled overnight without risk?

No. You shouldn’t fill a pool overnight while you’re asleep since someone should be monitoring it constantly. Plan the filling of your pool for the daytime when you are awake and ready to intervene if something goes wrong.

What is the ideal filter for using well water to fill a pool?

If you’re dealing with a pool that has a high concentration of metallic toxins, it’s recommended that you use a whole home water filter or a reverse osmosis filter for effective filtration.

It’s crucial to choose a filter that has the ability to eliminate harmful substances that can damage the pool’s components and necessitate more frequent cleaning.

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