Howard County, Maryland · Ellicott City
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Pipes freeze in Howard County on about 17 nights a year, mostly December to March. Older homes, 6% of the stock here, are most at risk.
September brings the most downpours to Howard County, part of 9.7 heavy-rain days a year. Check the sump first.
Sewage backups in Howard County spike on heavy-rain days, about 9.7 a year, when sewer mains fill up and water finds the lowest drain.
Howard County's wettest day in the 2015–2024 record brought 4.95 inches, and about 79 freeze-thaw days a year mean ice dams in some winters.
3% of occupied homes in Howard County heat mainly with wood or propane, below the Maryland county median of 9.3%.
Muggy summer nights, lows of 65°F or more, come about 55 times a year in Howard County. Mold after a leak spreads fastest from June through August.
Local risk profile
Howard County covers 251 square miles of northern Maryland, with about 336,328 residents and 125,286 homes. Ellicott City is the county seat; Columbia, Ilchester and Elkridge are the next largest communities. Much of its housing is recent, with a median build year of 1989.
47/100 Water Damage Risk Index: Elevated Howard County ranks 15 of 23 Maryland counties. See the statewide ranking and method.The three factors where Howard County ranks highest compared with other Maryland counties.
Howard is on the colder side of Maryland for pipes. It averaged 87 freezing nights a year over 2015–2024, 17 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 23 Maryland counties that's 7th.
Cold snaps are the real risk. The worst in the record lasted 7 days below freezing (ending January 2016), and the low bottomed out near 1°F on February 20, 2015.
The freeze season here runs December to March, with January the coldest. If you travel then, leave the thermostat at 55°F or above and open sink cabinets on outside walls.
On average the first fall freeze arrives around Nov 5 and the last spring freeze around Apr 4.
Heavy rain is a bigger factor here than in most of Maryland. About 9.7 days a year bring an inch or more (3rd of 23), most often in September, out of 46.5 inches of total precipitation. On July 22, 2018, 4.95 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 7.43 inches (through July 24, 2018).
The temperature crosses 32°F in both directions on roughly 79 days a year. Each cycle melts and refreezes water at roof edges and in foundation cracks, which is how ice dams and basement seepage get started.
Housing
Maryland's 23 counties range widely in housing age; Howard ranks 22nd, with 29% of its homes built before 1980.
Since 2000 the county has added enough housing that 29% of homes are that new. Modern PEX and copper rarely fail on their own; the leaks come from connections, appliances and storms.
The 1980s and 1990s account for 42% of the county's homes. If yours is from those decades, look under the sinks and at the water heater for gray plastic pipe stamped PB, which is polybutylene and leak-prone.
Beyond water
Howard County averages 55 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in July. Mold grows when indoor humidity stays above about 60%, the EPA's ceiling. A basement dehumidifier set to 50% and drying anything wet within 24 to 48 hours prevents most problems.
Mold remediation: what to expectMain heating fuel in Howard County's occupied homes: 42% utility gas, 50% electric, 3% propane and under 1% wood. Most homes here heat with gas or electricity, so cooking and electrical faults are the likelier fire sources. Even a contained kitchen fire can send soot through the ductwork to every room.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Howard County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Carroll and Frederick get more pipe-freeze nights than Howard. Baltimore County has the oldest housing nearby, with 59% of homes built before 1980.
By the numbers
| Factor | Howard | Maryland median | Rank |
|---|---|---|---|
| Homes built before 1960 | 5.5% | 20% | 23 of 23 |
| Homes built before 1980 | 29% | 44% | 22 of 23 |
| Homes built 2000 or later | 29% | 23% | 5 of 23 |
| Manufactured or mobile homes | 0.7% | 2.6% | 19 of 23 |
| Vacant homes | 3.4% | 7.7% | 23 of 23 |
| Wood or propane heat | 2.9% | 9.3% | 21 of 23 |
| Nights at 20°F or colder | 17/yr | 12/yr | 7 of 23 |
| Days with 1 inch+ of rain | 9.7/yr | 9.3/yr | 3 of 23 |
| Freeze-thaw days | 79/yr | 70/yr | 7 of 23 |
| Muggy nights (65°F+) | 55/yr | 76/yr | 18 of 23 |
Rank 1 is the highest value. Bars run from the lowest to the highest Maryland county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Howard County: freezing from December to March, heavy rain in July, September and October.
Sources: U.S. Census Bureau, ACS 2024 5-year estimates (2020-2024); weather from NOAA nClimGrid-Daily county averages (EpiNOAA), 2015–2024, averaged across the county; county boundaries from Census TIGER. Reviewed 2026-10-21. Methodology