If your Arnold home was built before lead pipe and lead solder were phased out of plumbing, the pipe that carries water from the street main into your house may be a source you have not checked. This is called the service line. It usually belongs to the property owner on the private side, while the water provider handles the main under the street. Knowing what material sits in that line is a practical first step before you buy any filter or change any fixture.

What lead is and how it reaches the tap

Lead is a metal. Water utilities do not add it. It can enter drinking water when water contacts lead parts, including older service lines, solder, and some brass fittings. Water that has sat unused in the pipe for a long time, such as overnight or during a long absence, tends to pick up more from the plumbing than water that has been running. Water chemistry also matters, because corrosive water can wear down the protective layer inside older pipe.

Find the material where the line enters

Start where the service line enters the house, usually in a basement, crawl space, or utility room near the water meter. Common materials include copper, galvanized steel, plastic, and older lead. A magnet gives a rough clue, since it tends to stick to galvanized steel but not to copper or plastic. Lead is soft and dull gray, and a light scratch with a key may leave a bright silver mark. A scratch test is only a clue, not proof, so write down what you see and move on to the records.

Check your records

Your city or water provider may keep records of the service line material for your address, especially if the home was built or repaired under a replacement program. Ask what they have on file for your property, and ask in writing if you can. Save the reply with your other water records. If the records are unclear, a licensed plumber can identify the material on a visit. Ask the plumber to show you the pipe and explain how they decided, rather than accepting a verbal answer.

Test the water you actually drink

A test shows what is in your water now, which matters more than what the pipe may have been decades ago. Use a state-certified lab and ask for a lead test on tap water. Labs often ask you to collect a first draw sample after water has sat unused overnight. Follow the lab's collection instructions exactly, since draw order and wait time change the result. Record the date, the tap you sampled, and whether anyone had run water at that faucet before you collected the sample.

Reduce exposure while you decide

  • After a long period of no use, run cold water for a while before drinking or cooking, and follow any flushing guidance from your water provider.
  • Use cold water for drinking and cooking rather than hot water, since hot water draws more from plumbing.
  • Clean faucet aerators to remove loose debris, and check that the screen is intact.
  • Do not boil water to try to remove lead, because boiling concentrates the metal.

Filters and treatment if lead is found

If a lab finds lead, the fix depends on the source. Replacing the service line or the affected plumbing removes the source, and a licensed plumber or your water provider can explain the options for your address. In the meantime, a filter certified for lead reduction can be used at a single tap. Check that the certification names lead specifically, and follow the change schedule, since an expired cartridge does not protect. A filter manages exposure at one tap but does not replace removing the source.

A local note for Arnold

Homes in Arnold draw on a mix of river and groundwater supplies, and public water reports describe the local tap water as hard. Hardness does not tell you whether lead is present, so the service line check and the lab test stand on their own. If your home is served by a private well, lead questions are handled differently, and you should follow the sampling steps for that well setup rather than this guide.