Service areas
Mammoth is based in Gaithersburg and dispatches to 25 communities across the county, 24 hours a day. If you are in Montgomery County, we cover you.
Home base · ZIP 20877, 20878, 20879, 20882, 20886
Gaithersburg is where Mammoth is based, so response times here are often well under 30 minutes. We work in everything from older ranch homes near Olde Towne to newer townhomes in Kentlands and Lakelands.
County seat · ZIP 20850, 20851, 20852, 20853, 20854, 20855
Rockville mixes mid-century single-family homes, high-rise condos near Town Center and commercial space along Rockville Pike. Condo leaks that travel between units are a frequent call here.
Serving 24/7 · ZIP 20814, 20815, 20816, 20817
Many Bethesda homes have finished basements with hardwood and custom millwork, which makes fast, measured drying especially important to save original materials.
Serving 24/7 · ZIP 20901, 20902, 20903, 20904, 20905, 20906, 20910
Silver Spring has a large stock of older brick colonials and garden apartments, where aging supply lines, cast-iron drains and below-grade units lead to leaks and sewage backups.
Serving 24/7 · ZIP 20874, 20875, 20876
Germantown townhome communities share walls and roof lines, so one failed water heater or washing machine hose can affect neighbors. We document carefully for HOA and insurance claims.
Serving 24/7 · ZIP 20854
Larger Potomac homes often have multiple HVAC zones, wine cellars and finished lower levels. Hidden leaks can go unnoticed longer, so thermal imaging is central to our inspections here.
Serving 24/7 · ZIP 20815
Chevy Chase has many early-1900s homes with plaster walls, original floors and older plumbing. We use drying methods that protect historic materials instead of tearing them out.
Serving 24/7 · ZIP 20832, 20830
Olney homes on larger lots often depend on sump pumps, and power outages during storms are a common cause of basement flooding.
Serving 24/7 · ZIP 20895
Kensington's older Victorian and craftsman homes often have stone foundations and crawlspaces where moisture and mold build up out of sight.
Serving 24/7 · ZIP 20902
Wheaton has dense neighborhoods of split-levels and ramblers where lower-level family rooms are especially vulnerable to heavy rain.
Serving 24/7 · ZIP 20906
Aspen Hill split-levels and condos see a steady mix of appliance leaks, slab leaks and basement seepage.
Serving 24/7 · ZIP 20871
Clarksburg has some of the newest construction in the county. New homes still flood: builder-grade supply lines, sump pumps and grading settle over the first few years.
Serving 24/7 · ZIP 20872
Upcounty Damascus homes often have private wells and longer driveways. Our crews come equipped to work with well systems and properties farther from main roads.
Serving 24/7 · ZIP 20882
Rural Laytonsville properties with barns, outbuildings and finished lower levels are common calls after storms and freeze events.
Serving 24/7 · ZIP 20860
Historic Sandy Spring homes and newer subdivisions both see crawlspace moisture issues that lead to mold if they are left alone.
Serving 24/7 · ZIP 20866
Burtonsville townhomes and single-family homes near the Patuxent watershed get heavy rain events that test sump pumps and window wells.
Serving 24/7 · ZIP 20886
Montgomery Village has many 1970s and 1980s townhomes and condos where aging plumbing and shared walls make leaks spread fast.
Serving 24/7 · ZIP 20878
North Potomac colonials with walk-out basements see both rain intrusion and appliance failures on upper floors.
Serving 24/7 · ZIP 20855
Derwood neighborhoods near Shady Grove have a mix of ramblers and newer homes, with frequent basement and water heater calls.
Serving 24/7 · ZIP 20906
Glenmont ramblers and duplexes with lower-level living spaces are vulnerable to sewer backups during heavy storms.
Serving 24/7 · ZIP 20912
Takoma Park's older bungalows and Victorians often have original plumbing and damp basements, so leaks and mold are frequent calls.
Serving 24/7 · ZIP 20812
Glen Echo homes on wooded, sloped lots near the Potomac see runoff and storm-related water intrusion.
Serving 24/7 · ZIP 20818
Cabin John properties on hillsides often deal with groundwater seepage and storm runoff into lower levels.
Serving 24/7 · ZIP 20837
In the Agricultural Reserve around Poolesville, wells, septic systems and outbuildings call for crews comfortable working on rural properties.
Serving 24/7 · ZIP 20841
Boyds homes are spread out and often rural, which makes a fast dispatch from nearby Gaithersburg especially valuable.
24/7 emergency line
Live dispatchers answer every call. A certified crew is on the way in minutes.