Rockville MD Rockville dispatch · North Potomac, MD
Emergency Plumber in North Potomac, MD: Water Heaters and Leaks in 1980s and 1990s Homes
The hot water runs out halfway through a shower, or the tank has started to weep at the base, and the house is nearly forty years old. That is the typical North Potomac call.
More than four in ten homes here were built between 1980 and 1989, and the median year built is 1988. It is a community of houses that all reached the same age at about the same time.
North Potomac's 1990 census designation and seven square miles
The 2002 master plan for the Potomac Subregion records that North Potomac was previously part of the Darnestown and Travilah areas and received a census designation in 1990. It covers only seven square miles, yet it has the largest population of any of the subregion's four communities.
The Census Bureau counts 8,402 housing units. About 17 percent were built before 1980, 43 percent in the 1980s, 24 percent in the 1990s, and about 16 percent since 2000. Owners occupy roughly 83 percent of occupied homes.
Same-age houses wear out together: what to expect
Houses built within a few years of each other wear out together. In North Potomac that makes some failures predictable, even though no single home is the same as its neighbour.
- The original water heater is long gone, so the one in the house is a replacement and its install date matters more than the house's
- Builder-grade faucets and toilet fill valves from the first owner are reaching the end of their working life
- Washing machine hoses and dishwasher supply lines, typically replaced by the second or third owner, are worth checking for bulging or rust at the fittings
- Outdoor taps on north-facing walls are the first to freeze in a hard winter
When one house on a street loses its water heater, the neighbours' are often close behind in age. A quick look at the label now gives you months of notice instead of a cold shower on a workday.
North Potomac's edges at Darnestown Road and Jones Lane
The plan places the northern and western edges of North Potomac at Darnestown Road and Jones Lane, and describes the area as lying roughly between Darnestown Road and Travilah Road. The University of Maryland Shady Grove campus sits at the Rockville end.
Key West Avenue and Darnestown Road are the two main access roads. That matters when we are planning a visit in rush hour, and it is why we ask which side of Darnestown Road you are on.
Public water, with wells inside the envelope
The Potomac Subregion Master Plan says WSSC provides community water to the plan area, and also that some areas inside the community water envelope continue to use individual wells. The plan makes that statement for the subregion as a whole, not for North Potomac alone.
So we ask. If your home has a well, it changes what we look for: pressure at the tank, sediment at the fixtures, and whether the symptom is the house or the supply. If it is on WSSC water, we start at the meter.
Before the first hard freeze
Montgomery County's residential construction parameters set the frost line at 30 inches and the winter design temperature at 13 degrees Fahrenheit. Those are the figures a footing or a buried line is designed for. Exposed pipes in garages and on north walls are not.
- Disconnect hoses and close the indoor shut-off to each outdoor tap, then open the tap to drain it
- On a hard night, leave vanity doors open along outside walls so room heat reaches the pipes
- Let one tap drip slowly if a supply line runs through an unheated garage
- Know where the main shut-off is before you need it, and check it turns
A short checklist before you call about hot water
- Read the label on the tank for the manufacturing date or serial number and note the capacity
- Look at the base of the tank and the pipes above it for moisture, rust streaks or a damp floor
- Check whether the problem is hot water at every tap or only at one fixture
- Note any noises such as popping or rumbling, which usually point to sediment inside the tank
North Potomac and ZIP code 20850
The community lies about 6 miles out from the middle of Rockville. Addresses under 20850 are on our dispatch list. Those under 20878, which most of the community uses, are not, so tell us your street and we will confirm whether we can reach you.
North Potomac plumbing questions
My North Potomac house is from the 1980s. Is the plumbing due for replacement?
Not as a whole. A house of that age usually needs specific parts replaced, such as the water heater, valves and fixtures, rather than everything. We look at what is failing and say so.
Do I have a well or WSSC water?
Check for a water bill from WSSC Water and a meter near the street. If there is a pressure tank in the basement or a pump house, you likely have a well. The county plan notes some wells remain within the water service area.
Why does hot water run out faster than it used to?
Sediment collects in the bottom of a tank and takes up room that hot water would use. A failing heating element or a dip tube fault can also cause it. The tank's age tells us which path to try first.
Should I replace a water heater that still works?
Age and condition decide it. A tank with rust at the base or a long history of repairs is worth replacing on your schedule. The page on tank replacement guidance lays out the signs.
Which road should I give when I call?
Give your street address and the cross road if you know it. North Potomac runs between Darnestown Road and Travilah Road, and the nearest main road tells dispatch how to route the visit.
Tank trouble, replacement and hidden leaks: which page fits
Tank problems are under water heater troubleshooting, and the decision about replacing one is under water heater replacement.
If the house is on a well, low pressure may also need a leak detection check to rule out a hidden loss before anyone blames the pump.
House built in the eighties and the hot water is failing?
Give us the water heater's age if you know it, or read us the label on the side. That decides whether the visit is a repair or a replacement.