If you have looked at a St. Peters water report, you have probably seen hardness near the top of the list. Hardness gets most of the attention because the tap water here is described as hard, and many homes already run a softener or are thinking about one. Lower down, many reports also list chloride and sodium. Those two items answer a different question than hardness does, so they deserve their own look.
Where chloride and sodium come from
St. Peters draws on a mix of river water and groundwater, and both can carry chloride and sodium naturally. Road salt used in winter can also wash into surface water and shallow groundwater, so the levels a utility reports can shift from one year to the next. Your report is the best place to see how the figures are described and whether they have been changing.
Softeners are a second source that homeowners often overlook. A softener removes hardness minerals by exchanging them for sodium, so softened water carries more sodium than the water that enters the house. That added sodium is expected behavior, not a sign that something has gone wrong. It does mean a softened tap and a raw cold tap can differ in sodium, and that difference is worth knowing about.
Read the report before you test anything
Start with the most recent consumer confidence report from the utility that serves your address. Find the chloride and sodium lines, check the units, and note the year. Then compare them with the previous year. A figure that stays flat tells a different story than one that climbs steadily. If you cannot find the lines, ask the utility to point you to them, and do not rely on an old copy from a neighbor.
Checks you can do at home
- Taste both outlets. Fill a clean glass from a cold tap as close to the main water entry as you can reach, then fill another from a softened outlet such as a kitchen faucet. Some people notice a salty or briny taste, and that observation is useful on its own, though taste is not a measurement.
- Use a home test kit for chloride or sodium if you want a rough reading. Kits for both are sold, and they give approximate results. Test the raw and softened outlets separately so you can see how much of the difference comes from the softener.
- Send a sample to an accredited lab if you need a reliable result for your records, a landlord, or a specific concern. Ask the lab to report chloride and sodium with clear units, and keep the paperwork with your report file.
- Keep every result with its date. A single reading is only a snapshot. Several readings across a season show whether anything is changing.
Private wells near St. Peters
If your home runs on a private well, the utility report does not apply to you. Chloride and sodium can be present in well water, and the source may be local geology, nearby road runoff, or a shallow aquifer affected by surface activity. A lab panel for a private well usually covers more than these two items, so ask for the full set. Parts of St. Charles County have naturally occurring minerals in deeper aquifers, and groundwater near the former Weldon Spring site has been documented as a concern, so ask the lab which panel fits your location. Bacteria testing is a sensible part of any well panel as well.
Does this change anything in the house?
A report can tell you what is in the water, but it cannot tell you how your plumbing and fixtures respond to it. Homeowners sometimes ask whether chloride or sodium affects pipes, fittings, or appliances. Watch your own fixtures over time, note any changes, and bring those notes to a plumber or a qualified water professional if something concerns you. Whether the sodium in your water matters for your diet is a question for your own doctor.
Next steps
Pull the latest report, find the two lines, and write down the year and units. Taste the raw and softened outlets. If the numbers matter to you, order a lab test with clear reporting, and repeat it on a schedule you can keep. That gives you an answer you can act on, instead of a guess based on one glass of water.