Water Wells 101 – Where does my water come from?

How Water Wells Work and Where Your Water Comes From

Despite the fact that 15% of Washington state residents receive their water from private water wells, but even more get their water from a public water systems fed by water wells.  Very few people actually know how water wells function. Even though most people will never work on their own well, it is still advantageous to know how it works and how important it is to do preventive maintenance and repairs.

What Is An Aquifer Anyway?

To begin you must understand what an aquifer is. An aquifer is a layer of materials underground typically something like sand and gravel or fractured rock layers that water flows through. The water filters through the ground until it reaches the layer where it can’t pass any deeper then travels through that layer to the lowest point ending in lakes, oceans, etc. These aquifers also act as filters as the water passes through them.

Aquifers - How ground water occurs in rocks and sand and gravel deposits

Ground water occurs in rocks, gravel, and sand deposits – in formations with pores that allow for water to move through the material.

The hydrogeologic cycle is what keeps our aquifers replenished.  The cycle of water passing from rain clouds, to the ground, then out into the ocean, and back as rain has been going on for millions of years.  Western Washington is particularly blessed with plentiful rainfall and many small aquifers throughout the area are often very reliable because of this.

The Water Cycle as depicted by the USGS

The water cycle depicts movement of water to different areas around the earth. The hydrologic cycle as depicted by the USGS.

How Water Wells Are Constructed 

A Washington residential well is typically made up of 6 inch steel or PVC pipes known as casing that are drilled down into the  aquifer in order to tap into that clean water running through it. Because the water inside the aquifer is moving, there is pressure behind it and some of the water inside the aquifer will force its way up into the casing. Typically it won’t have enough pressure to come all the way out of the casing but sometimes it does and these are called Flowing Artesian Wells. At the end of the casing is a slightly smaller screen that keeps any larger materials from the aquifer out of the well casing. 

A water well being drilled by JKA Well Drilling & Pumps in Monroe, Washington

A well drilling site in Monroe, Washington.

Now that we have the well we need to have a way to get the water out of it. This is where your pump comes in. The type of pumps that are most commonly used today are called submersible pumps. These pumps are placed at the end of the pipe underneath the water with wires running down alongside the pipes from the control box to the pump. When the pump is turned on it pumps the water up through the pipe and into the pressure tank and then the house. 

Drawing of a typical submersible well pump installation, with labeled components.

Drawing of a typical submersible pump installation

What’s In The Well House?

Now that we know what’s in the well we should go over what the aboveground components do. Generally speaking there are three major aboveground components, all of which need to be stored a frost proof enclosure, such as a well house. The pressure tank, the pressure switch and the control box. While some of these components can be switched out for other more specialized components these are the most common parts. 

A pressure tank and variable frequency drive motor controller

A pressure tank and variable frequency drive motor controller used for a private irrigation well in Shoreline, Washington.

The pressure tank serves multiple functions. Its first function is as a buffer for the pump. This means that every time you turn your water on it doesn’t have to turn the pump on. This is important because the hardest thing on a pump is starting. The less you start the longer it will last. It does this by storing a volume of water under a certain pressure and maintaining that pressure for longer than your pipes can. As part of this it acts as water storage. A 81 gallon tank will store about 21 gallons of water.  On the pressure tank is a pressure switch which informs the pump when to start and stop. The way it decides this is based on the current pressure in your system. Each pressure switch has a high pressure setting and a low pressure setting. The high setting tells the pump to shut off and the low settings tells it when to start. Without a pressure switch your pump would continuously run which can cause pipe damage or pump overheating.

The final component in a basic system is the control box. The control box is used to start the pump by providing a surge of electricity to help the pump start. It is also used to tie extra sensors into the pump wires. 

Some newer pump systems have Variable Frequency Drives, or VFD’s.   These pumps act as On Demand style well water systems and often can have a smaller tank on the surface.

If the well only produces a little bit of water, or the peak demands of the users of the well need more water than the well can pump in a given period of time, then a storage tank & booster pump system is often used.  A storage tank is an atmospheric tank, which means it’s not under pressure.  The well pump pumps water into the storage tank, which stores the water until a booster pump pulls it out to deliver it to the home, farm, or other water use.

Well your system may not look exactly like this these are the most common  type of systems installed in homes today. If nothing else that should give you a general idea of how you get your water.

Interested in learning more about your well water system?   Check out the Washington State Department of Health’s site on water systems, or the National Ground Water Associations consumer website, wellowner.org.

Do you need help with your water system? 

If you need well repairs, a well inspection, a well drilled, or any of the other well and water system related services we provide, you can email us 24 hours a day at service@jkawelldrilling.com, or call us at (360) 684-1932 (office hours are Monday-Friday, 730AM - 300PM).

Don’t Get Caught in the Cold: Protecting Your Snohomish County Well System from Winter’s Wrath

Living in Snohomish County, we know winter can pack a punch. While cozy fireplaces and snow angels are delightful, frozen pipes and malfunctioning pumps can quickly turn the dream into a nightmare. Protecting your well system from the icy grip of winter is crucial,...

The Two Types of Iron in Your Water

Living in Snohomish County? Chances are, your well water comes from aquifers nestled in iron-rich soil or rock. This natural mineral, while essential for our health, can pose problems in our water when present in excess. Let's dive into the world of iron in well water...

Low Water Pressure And How To Fix (Water Well Repairs FAQ)

Low water pressure can be a significant inconvenience, especially when it worsens over time. It can be a straightforward issue to resolve in some cases, while in others, it becomes a persistent problem. Therefore, it's valuable for homeowners to be aware of the common...

Does Monroe Washington Have a Lot of Wells?

Yes, Monroe, Washington has a lot of wells. According to the Washington State Department of Ecology, there are over 10,000 active wells in the city of Monroe. This is because Monroe is located in a region with a high water table and abundant groundwater resources....

FAQ: When Should I Replace My Well Casing?

The lifespan of a well casing can vary depending on a number of factors, including the type of casing material, the quality of the installation, and the environmental conditions. In Washington state, well casings typically last for 30-50 years, sometimes longer....

Here are some additional tips for well owners with older wells:

Be aware of the signs of well problems. This could include low water pressure, brown or cloudy water, or an unpleasant taste or odor. Have your well inspected more frequently than every 10 years, especially if you are located in an area with known groundwater...

FAQ: If My Well Is More Than 10 Years Old, What Do I Need to Do?

If your well is more than 10 years old, you should have it inspected by a qualified well contractor or inspector. This will help to identify any potential problems with your well, such as damage, corrosion, or leaks. The inspector may also recommend any necessary...

How Do You Get Water for Irrigation?

Accessing water sources for irrigation involves several steps, including understanding local regulations, obtaining necessary permits, and installing the appropriate infrastructure. Here's a general guide on how to access water sources for irrigation: Identify Water...

Without a Home Inspection Before Buying, You Might Run Into Problems

Without a home inspection before buying, you might run into several potential well issues that could pose significant problems and expenses. A well inspection is crucial, especially for properties with a private well as their water source. A well inspection can reveal...

What Regulatory Requirements Lead to Well Decommisions? (Pacific Northwest – Monroe, WA)

In the northwest region, the specific regulatory requirements that can lead to the decommissioning of a well may vary depending on the jurisdiction and local regulations. However, here are some common regulatory factors that could contribute to the decommissioning of...

ASSOCIATIONS & MEMBERSHIPS