The Philadelphia drain and sewer year
Twelve months of what actually fails, what to do before it does, and when to book. Built from rowhouses, combined sewers and Delaware Valley weather — not generic advice.
What each month does to your pipes
January — deep freeze
Sustained cold finds every exposed line: hose bibs, crawlspace runs and sump discharge outlets that terminate above grade. Keep cabinet doors open on sub-zero nights, disconnect hoses before the first hard freeze, and check that the sump discharge is not building an ice dam at its outlet. A discharge line that freezes solid burns out the pump motor within hours.
February — freeze and thaw
Freeze-thaw cycles open soil gaps around laterals and let meltwater pour in. Sump pumps run their longest hours now; listen for short-cycling, which means a stuck float or a frozen outlet rather than a dead pump. This is also when cast iron stacks show their age — repeated slow drains that cabling fixes for a week point to internal scale, not a fresh clog.
March — spring rains arrive
The first sustained storms surcharge combined sewers and test every basement. Test the sump by pouring a bucket into the pit, confirm floor drains still hold trap seals, and clear leaves off catch basins near the property. Planning to landscape or pour a driveway? Camera the lateral first — nothing is more expensive than a new patio over a failing pipe.
April — roots wake up
Maples and London planes leaf out and root growth surges into clay-tile joints. If last year ended with a root cutting, this is the month for the follow-up camera pass that shows whether the joint needs repair or just another clearing cycle. Downspouts come off winter extensions now; confirm they discharge away from the foundation, not into the lateral.
May — digging season
Fence posts, decks, patios and plantings all break ground in May. Submit the PA One Call locate request before anyone digs — private laterals are yours to mark via a private locate, and a sliced lateral costs more than the project it was dug for. New plantings go in now too: keep thirsty species off the lateral corridor.
June — storm season and backups
Short violent storms overwhelm combined sewers faster than all-day rain. Know where the lowest fixture is, keep valuables off basement floors, and document any backup with video while it happens — PWD needs it for a Basement Backup Protection Program application. If the lateral is sound, ask about a backwater valve before the next storm, not after it.
July — heat, grease and guests
Cookout grease is the July killer: fats poured down the sink congeal in the first cool joint and seed the autumn backlog. Bin it, jar it, trash it — never the drain. Rental turnover around universities peaks too; University City and West Philadelphia twins clog hardest in move-in weeks.
August — saturated soil
Hurricane remnants and tropical moisture saturate soils for weeks, stressing old clay joints and floating debris into storm drains. Watch for new soggy strips over the lateral corridor and gurgling after storms — both mean infiltration is narrowing the bore. Commercial kitchens: the pre-holiday jetting window opens now, before autumn bookings fill.
September — turnover and tune-ups
Student turnover clogs and end-of-summer grease converge. Rental owners from University City to Norristown should camera chronic lines before signing autumn leases. Homeowners: this is the best-value jetting month — dry ground, open schedules, and a clean pipe before leaf fall and holiday load.
October — leaves and preparation
Falling leaves pack catch basins and wash silt into storm laterals. Clear grates, flush gutters away from the foundation, and schedule the pre-holiday kitchen-line jetting before Thanksgiving books out. Sump pits get a final clean-out; a pit full of silt cannot hold a storm.
November — holiday grease surge
Thanksgiving week is the busiest drain week of the year: turkey fat, potato starch and a house full of showers and laundry. Scrape plates into the trash, stagger laundry loads, and know where the main cleanout is before guests arrive — finding it during a backup is nobody’s idea of a holiday.
December — guests, load and freeze
Extra showers, extra laundry and extra cooking push marginal lines over the edge, then the first hard freeze locks in whatever is slow. HOA boards: spend remaining maintenance budgets on camera inspections now — a December scope prevents a February excavation. Disconnect hoses, insulate exposed bibs, and keep the sump outlet clear of snow.
Timing questions
When is the cheapest time for drain work?
Late winter and early autumn: dry ground, open schedules, preventive pricing. Emergency premiums cluster around holiday weeks, deep freezes and major storms — the same work costs less booked a month earlier.
When are Philadelphia drain emergencies most common?
Two peaks: violent summer storms that surcharge combined sewers, and holiday weeks when guest load meets grease. Freeze weeks add a third smaller peak of burst bibs and burnt-out sump pumps.
How far ahead should maintenance be scheduled?
Two to four weeks for preventive jetting or camera work in spring and autumn; same-week in quiet stretches. If a date matters — lease signing, board meeting, holiday hosting — book six weeks out.
Does this calendar apply in the suburbs too?
Yes, with local shifts: river towns flood earlier in storms, Main Line shade lots root harder in April, and outlying Bucks and Chester county properties need longer lead times for any visit.