Well Water Basics for Kitsap and Mason County Homeowners

Where well water comes from around here

The Kitsap Peninsula and the Mason County lowlands are glacial deposits: layers of sand and gravel that hold water, separated by till and clay that do not. A drilled well passes through the layers until it reaches a saturated aquifer with enough yield, and a steel or PVC casing keeps the hole open and keeps surface water out. Depths vary a great deal from one road to the next; neighbors can have a sixty-foot well and a three-hundred-foot well.

Some older properties, especially cabins near Hood Canal and in the Tahuya area, still have shallow dug or driven wells, and a few have springs. Those are more vulnerable to surface contamination and seasonal drops. If you are buying a property with a well, the well log, filed with the state when it was drilled, tells you the depth, casing, and tested yield, and it is worth tracking down.

The parts of the system, from the bottom up

Down in the casing sits the submersible pump, a long cylinder with a motor on the bottom and pump stages on top, hung on a drop pipe and a power cable. Older or shallow wells sometimes use a jet pump at the surface instead. The pump pushes water up to a pitless adapter, a fitting through the casing wall a few feet underground, below frost depth, that lets the water line leave the well horizontally toward the house.

Inside the house, a well house, or a crawlspace, the line reaches the pressure tank. The tank has a rubber bladder or diaphragm with compressed air on one side and water on the other. The air cushion stores water under pressure so a faucet gets flow without the pump starting every time, and it lets the pump run in reasonable cycles rather than flicking on and off. Well-X-Trol and Amtrol are the tanks we install most.

A pressure switch next to the tank reads line pressure and closes a contact to start the pump at the cut-in pressure and opens it at the cut-out, commonly 40 and 60 psi. A pressure gauge, a check valve, a drain, and a shutoff round out the tank tee. From there the water may go through a sediment filter, an iron filter, a softener, or a UV light before heading to the house plumbing.

What Kitsap Public Health District asks of well owners

The district regulates private and small group wells in the county and keeps its guidance simple. It recommends that private well owners test for bacteria annually and for nitrate every three years, sending samples to an accredited lab. It wants the wellhead kept above grade, at least six inches, and accessible, with the cap and casing sealed, because openings there let surface water and contamination straight into the well.

Since 2019, a Water Status Report from the Health District has been required before a property served by a private well or a Group B system can be sold. The district recommends applying about 30 days before closing so any problems can be fixed first, and it reports that in 2025 close to half of the private well reports it issued identified significant problems. A loose cap, a wellhead in a pit, or missing records are typical findings.

Group B systems, which serve three to fourteen connections and are common on shared-well parcels in rural Kitsap, need a current operating permit, user agreements, and their own sampling schedule. If you share a well with neighbors, find out who holds the permit before a problem arises. Mason County Public Health has its own well program; contact them for properties in Belfair, Allyn, Shelton and the Hood Canal communities.

Water quality in local wells

The water in Puget Sound aquifers is generally low in hardness compared to most of the country. What it does carry, depending on which layer the well draws from, is dissolved iron and manganese. A U.S. Geological Survey study of groundwater in central Kitsap County found manganese above the secondary drinking water standard in a majority of the wells sampled and iron above its standard in a good number, with the exceedances tied to low-oxygen conditions in certain aquifer layers. Those are aesthetic standards, not health limits, but they stain fixtures and laundry orange or black and give water a metallic taste.

Hydrogen sulfide, the rotten-egg smell, is the next most common complaint, especially in deeper wells and in hot water. Sulfur bacteria in the well or in the water heater produce it. Some wells also run acidic, with low pH that corrodes copper and leaves blue-green stains. Nitrate shows up occasionally near older septic systems and farmland, which is why the district wants it tested.

Arsenic occurs naturally in some Puget Sound aquifers and does not announce itself by taste or color; if you have never had your well tested for it, that is worth adding to the next lab order. A full panel once, then bacteria yearly and nitrate every three years, gives you a complete picture.

Maintenance a well owner can do

A private well mostly runs itself, but a few habits catch problems early. These are the ones we tell every new well owner.

• Walk to the wellhead each season: cap tight, casing above grade, no standing water, no rodent or insect entry, no sprinkler spraying on it
• Note the pressure gauge reading when a faucet is running and when the pump has shut off; a changing pattern is the first sign of tank or switch trouble
• Listen for the pump cycling: a pump that starts and stops every few seconds while a faucet runs means the tank has lost its air charge
• Replace sediment filter cartridges on schedule and watch how fast they load up
• Keep records: well log, pump replacement date, tank date, test results
• Send a bacteria sample to a lab every year, and a nitrate sample every three

What a plumber does, what a pump company does, and what a well driller does

We handle the well house and everything plumbed on the house side of it: setting new pressure tanks and switches, replacing gauges and check valves, rebuilding the tank tee and manifold, repairing the line from the well house to the home, insulating and heating the building, fixing a frozen or broken yard hydrant, and installing treatment after the tank. Most of that is a half-day job with parts we carry.

A well pump company handles the pump: pulling it from the casing, replacing the submersible or jet pump, the drop pipe, the pitless adapter and the control box. That work takes a hoist and well-specific gear, and we do not do it. When our tests at the well house point to the pump, we tell you so and refer you to a pump outfit, and we are glad to coordinate so the tank and switch side is ready when they set the new pump.

A licensed well driller handles the well itself: drilling new wells, deepening or hydrofracturing a well that has lost yield, repairing casing, and the decommissioning the state requires when a well is abandoned. If your problem is that the well has run dry in late summer, that is a driller conversation; if the tank is waterlogged, the switch is burned or the well house froze, that is ours.

Freezes, outages and the rural wrinkle

A well house or an exposed pressure tank is the first thing to freeze when an arctic blast comes through, as many Mason County owners learned in December 2022 and January 2024. Insulating the well house, keeping a small heat source in it, and wrapping exposed pipe near the tank go a long way. A tank tee that splits in a freeze floods a crawlspace fast.

Power outages stop the pump, and Peninsula Light and Mason PUD customers in the wooded parts of the county lose power more often than city residents. A generator with a circuit for the well pump, or at minimum a few days of stored water, is sensible on a rural property. When the power comes back and the pump has been dry, let it refill the tank and run a faucet to clear air before judging the system.

Septic and well share the same yard, and the state sets minimum separation distances between a wellhead and a drainfield. If you are adding a drainfield, a shop, or a structure near the well, the county will want to see those distances honored. Keeping the well upslope and away from where wastewater goes is the single best protection a rural homeowner has.