If you run a private well in Washington, the lab report that comes back after a sample is often the first full look at what is in your water. A public water system sends a report every year, but a well has no one doing that for you. The report in your hand may be the only one you have, so it is worth reading slowly before deciding anything.
What a Typical Report Contains
Most reports share the same basic layout. Reading the parts in order keeps you from jumping to conclusions.
- Sample date, sample location, and the lab name
- Each tested parameter, its result, and the unit the lab used
- A detection limit or reporting limit for each result, which is the smallest amount the lab can reliably measure
- A comparison or reference level, where one exists, often borrowed from public water rules
- Notes about how the sample was taken, such as whether it came from a cold tap that had been running
Terms That Show Up Often
Hardness
Hardness reflects calcium and magnesium. Well water in the Franklin County and river-bottom area commonly runs harder than public supply in the region, so a hardness line is common on local reports. Hardness shows up as scale on fixtures, soap that does not lather well, and spots on dishes. It is mainly a question of scale, soap use, and appliance wear.
Iron and Manganese
Iron and manganese are metals that can stain laundry, fixtures, and toilet tanks. Reports may list dissolved and total versions. Dissolved iron that turns orange after sitting in air points to a different fix than particles that were already suspended in the water when it was sampled.
Radium and Gross Alpha
Some Washington well reports include a radium result or a gross alpha measurement. These measure naturally occurring radioactivity, and deeper bedrock wells in the region can carry more of it than shallower wells. A gross alpha result is a screening measurement, and radium may need its own specific test. Do not treat either result as a final answer until the lab confirms which specific parameters were tested.
Nitrate
Nitrate often comes from fertilizer, animal waste, or septic systems. Farmland and rural homes near septic fields are common sources around Washington. Nitrate is usually tested on its own, and a standard panel may not include it, so check whether it appears on your report.
Coliform and E. coli
Bacteria results are usually listed as present or absent rather than as a quantity. A presence result after flooding, after well work, or after a new pump is a reason to disinfect the system and retest rather than wait.
Hydrogen Sulfide
Rotten egg smell comes from hydrogen sulfide, which is not always included on a standard panel. If your water has that odor, ask the lab whether it can be tested separately.
Check the Sample Before Trusting It
A result is only as good as the sample behind it. Before acting on a surprise, check the basics.
- Was the sample taken from a cold tap, away from the aerator, after running the water for the time the lab asked for?
- Was the sample taken before or after a filter, softener, or other treatment unit? Both can be useful, but they answer different questions.
- Did the sample reach the lab within the time the lab requires, and was it kept cool as instructed?
Turning Results Into Next Steps
- Mark every result that was flagged as above a reference level or listed as present.
- Call the lab and ask whether a retest is recommended and how soon.
- Compare the results with what you see and smell at home, such as staining, slime, cloudiness, or a rotten egg odor.
- Look at the well surroundings, including the cap, the casing, nearby septic components, and any flooding history.
- Keep the report with its sample date in a dated folder, so future results can be compared side by side.
- Bring the report to a qualified water professional before choosing any treatment, so the equipment is matched to your specific results rather than a general guess.
Questions to Ask the Lab
- Which parameters were tested, and which common ones were left off?
- What is the detection limit for each result?
- Does this result apply only to this sample, and how should a retest be scheduled?
- What does each reference level on the report compare against, and does it apply to a private well?
Washington homeowners do not need to become water chemists. A clear report, a dated folder, and a retest plan usually lead to better decisions than guessing from taste or color alone. Read the report, check the sample, and take the next step in order.