Springfield was plumbed across four decades, and the decade decides the trouble. North Springfield, about two thirds of it built before 1960, went up with galvanized steel supply that slowly rusts shut from the inside. Kings Park and most of West Springfield are 1960s and 70s houses, usually copper supply over cast iron drains. Newington Forest went up mostly in the 1980s and 90s, inside the stretch when grey polybutylene was going into new houses.
The pressure valve is the Springfield question. Fairfax County’s plumbing code only started requiring one on December 4, 1972, and the median owner home here was built in 1968, so a lot of Springfield houses were built before anyone required one. Fairfax Water’s rules cover exactly that case: a house built before that date that sees more than 80 psi gets the valve from the utility, and the owner pays to have it installed and kept up.
Pressure over 80 psi is hard on faucet cartridges, toilet fill valves and the relief valve on the water heater. A gauge on the hose bib reads it in a minute; if it’s high, a pressure reducing valve runs $500 to $1,000 installed, with an expansion tank to go with it.
Under the yard, a 1950s or 60s house may still drain through its original lateral, and the county puts all of it on you, out to the main. Roots find the joints in old clay and cast iron. A camera, $89 added to a visit, shows whether it’s a root, a sag or a break before anybody mentions a shovel.