Sewer Backup During a Summer Storm: Emergency Steps for PA Homeowners
What to Do Right Now If Your Sewer Is Backing Up
A sewer backup during a summer storm sends raw sewage in reverse through your home’s drain system, creating an immediate health hazard and an active plumbing emergency. Take these steps right now: stop all water use in the home, keep family members and pets away from every affected area, do not touch sewage without waterproof gloves and eye protection, and call a licensed plumber. These actions limit exposure and stop the backup from worsening while help is on the way.
Mastery Plumbing dispatches emergency plumbing service throughout the Allentown and Quakertown, PA area around the clock. Call 267-633-8799 immediately for a 24/7 response. The emergency steps and causes below give you the full picture of what is happening and what comes next.
What Is a Sewer Backup and Why Does It Happen During Rain?
A sewer backup occurs when wastewater in the drain system cannot flow forward toward the municipal main and reverses direction, re-entering the home through floor drains, basement toilets, and low-lying fixtures. Under normal conditions, gravity and proper grade keep wastewater moving away from the home. During a heavy summer storm, two forces work against that flow: hydraulic pressure from an overwhelmed municipal system can push water back through the connection into private laterals, and a partial blockage that was manageable under normal load suddenly becomes a full obstruction when storm surge increases the volume of water the system must carry.
Pennsylvania’s combination of aging urban sewer infrastructure, dense tree coverage over residential lots, and intense summer storm events creates conditions where sewer backups are more likely during the June through September period than at any other time of year. Understanding the cause helps homeowners protect themselves and communicate more effectively with the plumber responding to the call.
Why Summer Storms Cause Sewer Backups in Pennsylvania Homes
Combined Sewer Overflow
Portions of Allentown and other older Pennsylvania cities operate on combined sewer systems, where storm runoff and sanitary sewage share the same underground pipe. The U.S. Environmental Protection Agency documents that combined sewer overflows (CSOs) release tens of billions of gallons of untreated sewage annually across the country during heavy rain. When a summer storm delivers more runoff than the combined system can transport, the overload seeks the path of least hydraulic resistance, which is frequently a residential floor drain or basement toilet connected to the main.
Root Intrusion in Older Sewer Laterals
Summer is peak growing season for tree root systems throughout the Lehigh Valley and Bucks County. In homes built before 1970, the private sewer lateral, the pipe connecting the home to the municipal main, is most commonly made of clay tile. Clay tile joints expand and contract seasonally, creating gaps that tree roots exploit over decades. By midsummer, roots that have infiltrated the lateral throughout spring have significantly restricted carrying capacity. A storm-driven surge of hydraulic pressure converts a partially blocked lateral into a complete backup.
Grease and Organic Buildup
Summer cooking generates more fats, oils, and greases than other seasons through heavy kitchen activity, outdoor cooking drains, and increased household food preparation. These materials coat drain interiors and accumulate alongside root debris, steadily narrowing the pipe’s effective diameter. A line that is 60 percent blocked under normal daily load reaches complete blockage when storm surge pressure is added.
Absence of a Backflow Preventer
Homes without a backflow preventer on the main sewer lateral have no mechanical defense against pressure reversals from the municipal main. When city system pressure spikes during a storm, the path of least resistance into a lower-pressure space often runs directly into the home through any ground-level fixture. Installing a backflow preventer is the most effective single action a homeowner can take to protect against future storm-driven backup events.
Warning Signs Your Sewer Is Starting to Back Up
Catch these signals early enough and a single plumbing call prevents a health emergency.
- Multiple drains throughout the house slow down at the same time during or after rain
- Toilets gurgle or bubble when you run water in a sink, tub, or washing machine elsewhere in the home
- A floor drain in the basement or laundry room shows water rising rather than draining
- A sewage odor rises from floor drains or toilets, especially on the lowest level of the home
- The washing machine drains and a floor drain or toilet backs up simultaneously
- Any fixture at ground level or below backs up when upper-floor fixtures are used
Any one of these signs during a storm warrants stopping water use and calling 267-633-8799 immediately. Waiting to see if it resolves on its own typically allows the backup to spread.
What You Can Do Safely vs. What Requires a Licensed Plumber
Raw sewage contains E. coli, Hepatitis A, Salmonella, Giardia, and hydrogen sulfide gas. The boundary between what homeowners can safely handle and what requires professional response is clear: physical contact with sewage water or active clearing of a sewage-affected drain line are not DIY tasks.
What you can do safely without professional help:
- Stop all water use in the home immediately, including flushing toilets and running any faucet or appliance that drains
- Keep all family members and pets out of affected areas and prevent children from re-entering
- Document visible damage with photos and video for insurance purposes without entering sewage-contaminated zones beyond what is necessary
- Call your municipal utility to report a possible combined sewer overflow if you believe the backup is coming from the street side
- Contact your homeowners insurance carrier to report a potential claim
What requires a licensed, insured plumber:
- Any snaking, clearing, or jetting of the main sewer lateral or affected fixture drains
- Sewer camera inspection to identify the cause and location of the blockage
- Backflow preventer assessment and installation
- All sewer line repairs, whether trenchless or open-cut
- Water damage assessment for structural materials that may require remediation
Step-by-Step Emergency Response for PA Homeowners
- Stop all water use immediately. Do not flush toilets, run faucets, use the dishwasher or washing machine, or take showers until the source of the backup is identified and cleared.
- Get everyone away from affected areas. Place barriers if needed. Children and pets should leave the basement or laundry room if backup has occurred there.
- Do not attempt to clean up sewage without full waterproof gloves, eye protection, and footwear that can be thoroughly disinfected afterward. If any structural material is saturated, do not enter without professional guidance.
- Check whether basement flooding is active. If the water level is rising rapidly and presents a risk to electrical panels, circuit breakers, or HVAC equipment, call emergency services in addition to a plumber.
- Call 267-633-8799 for 24/7 emergency plumbing service from Mastery Plumbing. State that you have an active sewer backup so the dispatcher can prioritize your call.
- While waiting for the technician, document all visible damage with photos and video. Note which fixtures are affected and when the symptoms first appeared.
- Locate your main sewer cleanout access point if you know where it is. Providing this information to the technician on arrival speeds up the assessment process.
How Mastery Plumbing Responds to Sewer Backups
Our technician begins with a systematic assessment to determine whether the backup is caused by a main lateral blockage, a municipal CSO event, root intrusion, or structural pipe damage. We use sewer camera inspection to locate the obstruction precisely without guesswork or unnecessary excavation. Once the cause is confirmed, we select the appropriate solution:
- Drain cleaning clears debris and organic buildup from fixture drains and the upper section of the lateral.
- Hydro jetting uses high-pressure water to cut through root intrusions, strip grease buildup, and flush the full diameter of the pipe. This is the standard response for root-driven backups.
- Sewer repair addresses collapsed sections, offset joints, and cracked pipe confirmed by camera.
- Trenchless sewer replacement rehabilitates a lateral with widespread structural failure by installing a new liner inside the existing pipe, preserving landscaping and hardscaping in the process.
We also discuss backflow preventer installation during every sewer emergency visit for homeowners in combined sewer service areas or with recurring backup history.
Sewer Backup Risk in Allentown, Quakertown, and the Lehigh Valley
Allentown’s older neighborhoods on the South Side and West Side operate on combined sewer infrastructure dating to the early and mid-20th century. The Pennsylvania Department of Environmental Protection tracks CSO events across the Commonwealth, and Allentown’s system has documented discharge during intense summer rain events. Quakertown and surrounding upper Bucks County communities operate separated storm and sanitary systems, but aging clay laterals and dense residential tree coverage make root intrusion the primary summer backup driver in those areas.
The Lehigh Valley averages 3 to 4 inches of rainfall in July, with convective storm events capable of delivering over an inch in under an hour. These high-intensity, short-duration events are the conditions most likely to simultaneously fill municipal systems to capacity and push hydraulic pressure back through private connections. A home that has experienced one storm backup without a backflow preventer installed will almost certainly experience another.
When to Call Mastery Plumbing for a Sewer Emergency
Call 267-633-8799 immediately any time sewage is backing up into your home. Mastery Plumbing holds Pennsylvania Plumbing License PA133897 and is fully insured and bonded for all sewer emergency work throughout the Allentown and Quakertown service area. Our 24/7 emergency plumbing service means a licensed technician is available at any hour, including weekends and holidays, with no after-hours surcharge. Our 4.8-star Google reviews and Yelp profile reflect 25+ years of licensed master plumber experience solving exactly these situations for Lehigh Valley and Bucks County homeowners.
Frequently Asked Questions About Sewer Backups During Summer Storms
What causes a sewer to back up during a summer storm?
The most common causes in Pennsylvania are combined sewer overflow (CSO), where storm runoff overwhelms a shared storm-and-sanitary system and forces sewage back into homes; root intrusion in aging clay or cast iron sewer laterals, which reaches its worst during summer growth season; grease and organic buildup that partial-blockages the lateral; and the absence of a backflow preventer, leaving the home open to hydraulic pressure from the municipal main. Older Allentown neighborhoods are particularly vulnerable to CSO events during intense summer rain.
Is a sewer backup during a storm dangerous to my family?
Yes. Raw sewage contains bacteria such as E. coli and Salmonella, viruses including Hepatitis A and Norovirus, and parasites such as Giardia. Sewage gases, including hydrogen sulfide, are also present and can accumulate in enclosed spaces. Anyone who contacts sewage water or breathes sewage gases in an unventilated space is at risk. Children, elderly family members, and anyone with a compromised immune system face heightened risk. Do not allow family members or pets into a sewage-affected area until it has been professionally assessed and cleaned.
How quickly do I need to call a plumber for a sewer backup?
Immediately. Sewage in the home continues spreading as long as the line is blocked. Organic material saturated with sewage can begin supporting mold growth within 24 to 48 hours. Beyond the structural damage, the health risk from exposure increases with time. Mastery Plumbing operates 24/7 for sewer emergencies throughout the Allentown and Quakertown service area. Call 267-633-8799 as soon as the backup is discovered.
Can I clean up a sewer backup myself?
Minor surface moisture from a brief backup can be wiped down by a homeowner using rubber gloves, eye protection, and a disinfectant rated for sewage cleanup, provided no structural materials (drywall, subflooring, insulation) have been saturated. Once structural materials are wet with sewage, professional remediation is required to prevent mold and ensure adequate disinfection. Under no circumstances should a homeowner attempt to clear the main sewer line without professional equipment. Call a licensed plumber to restore drainage before any cleanup begins.
Why does my basement floor drain back up when it rains heavily?
A basement floor drain that backs up during rain almost always indicates that the main sewer lateral is receiving more load than it can carry. Causes include a combined sewer overflow from the municipal system, a lateral blockage such as root intrusion or grease accumulation that the storm surge pushes past its tipping point, or a failed or absent backflow preventer on the lateral. The floor drain is typically the lowest fixture in the drainage system and shows backup symptoms first. Call 267-633-8799 to schedule a sewer camera inspection.
Does homeowners insurance cover sewer backup damage?
Standard homeowners insurance policies in Pennsylvania generally do not cover sewer backup damage unless the homeowner has purchased a separate sewer backup endorsement or rider. Water damage resulting from a sewer backup is distinct from flooding and is typically excluded from both the main policy and standard flood policies. Homeowners in areas prone to combined sewer overflow or root intrusion should review their policy annually and consider adding sewer backup coverage. Document all damage thoroughly before any cleanup begins to support a potential claim.
What is a combined sewer overflow and does it affect my Allentown home?
A combined sewer overflow (CSO) occurs when a combined sewer system, one that carries both stormwater and sanitary sewage in the same pipe, receives more volume than it can transport during a rain event. The excess overflows into local waterways or, in some cases, reverses into residential connections. Parts of Allentown operate on combined sewer infrastructure dating to the early 20th century. The EPA has documented CSO events across Pennsylvania’s older urban systems. Homes connected to combined sewer mains in these areas are at increased risk during summer storms. A backflow preventer is the most effective residential protection.
How do I prevent sewer backups during storms?
Prevention strategies for Pennsylvania homeowners include: installing a backflow preventer (check valve) on the main sewer lateral, which Mastery Plumbing can install; scheduling annual sewer camera inspections to catch root intrusion and buildup before they become blockages; avoiding grease and wipes disposal down drains; and having the main lateral hydro jetted every two to three years if the home has mature trees overhead. Homes in Allentown and Quakertown with clay laterals and overhead tree coverage benefit most from proactive lateral maintenance.
What is a backflow preventer and does my PA home need one?
A backflow preventer, also called a check valve, is a device installed on the main sewer lateral that allows sewage to flow toward the municipal system but mechanically prevents it from flowing back into the home. Pennsylvania plumbing code allows and encourages their installation, particularly for homes on combined sewer systems or in low-lying areas. Mastery Plumbing installs backflow preventers as both a standalone service and as part of post-backup restoration. Call 267-633-8799 to discuss whether your property is a good candidate.
Why do my drains gurgle after heavy rain in the Lehigh Valley?
Gurgling sounds from drains during or after heavy rain indicate that air is being displaced in the drain-vent system. This happens when the sewer line below the home is partially full or under elevated pressure from storm surge or a partial blockage. The air, with nowhere to go in the main line, pushes back up through the trap in nearby fixtures, creating the gurgling sound. This symptom is an early warning of a sewer backup that has not fully materialized yet. A camera inspection can identify whether root intrusion or another blockage is developing.
Can tree roots cause a sewer backup during a summer storm?
Yes, and summer is when this combination is most dangerous. Tree root systems grow most aggressively during warm months when soil moisture is available. In homes with clay sewer laterals, roots infiltrate through pipe joints throughout spring and summer. By midsummer, accumulated root growth inside the lateral significantly restricts flow capacity. A heavy rainstorm creates additional hydraulic load that exceeds what the partially blocked pipe can handle, triggering a backup. Homes with large established trees directly over the sewer lateral path are most at risk. Hydro jetting combined with camera inspection is the correct treatment.
How long does a professional sewer emergency response take?
Mastery Plumbing dispatches a licensed technician to Allentown and Quakertown area properties as quickly as possible after an emergency call. Upon arrival, sewer camera inspection takes 20 to 45 minutes to pinpoint the blockage location. Hydro jetting to clear root intrusion or debris typically takes one to two hours depending on lateral length and severity. Repairs to a damaged section, if needed, are assessed and quoted separately. Most emergency drain clearing and inspection visits are completed in a single visit.
Does Mastery Plumbing handle sewer emergencies on nights and weekends in PA?
Yes. Mastery Plumbing provides 24/7 emergency plumbing service throughout the Allentown and Quakertown service area, including nights, weekends, and holidays, with no after-hours upcharge. A sewer backup is a plumbing emergency that cannot wait for normal business hours. Call 267-633-8799 any time for immediate dispatch.
What is trenchless sewer repair and is it an option after a storm backup?
Trenchless sewer repair installs a new pipe liner inside an existing damaged lateral without excavating the full line. After a storm backup reveals structural damage through camera inspection, such as collapsed sections, severe root intrusion, or offset joints, trenchless methods often provide a faster and less disruptive repair than traditional open-cut excavation. Mastery Plumbing evaluates suitability for trenchless repair during the camera inspection and presents options with their respective trade-offs so homeowners can make an informed decision.
After a sewer backup, what steps protect my family and property?
After the sewer line has been cleared and restored by a licensed plumber, take these steps: ventilate affected areas thoroughly before re-entry by opening windows and doors; contact a professional sewage remediation company for any area where structural materials were saturated; discard any food, bedding, or soft goods that contacted sewage water; disinfect all hard surfaces with an EPA-registered disinfectant; wash all clothing exposed to sewage separately and at the hottest water temperature; and consult your physician if anyone in the household had direct contact with sewage water. Call your insurance carrier to report the event and document all remediation steps.
Get 24/7 Emergency Sewer Service in Allentown and Quakertown, PA
A summer storm sewer backup is one of the most time-sensitive plumbing emergencies a homeowner faces. The faster the lateral is cleared and the home is assessed, the less damage spreads to structural materials and the lower the health risk for your family. Mastery Plumbing (License PA133897) serves the entire Allentown, Quakertown, and Lehigh Valley service area with licensed, insured emergency plumbing around the clock. Call 267-633-8799 right now for immediate dispatch, or ask about our VIP Care Plans for priority scheduling and annual plumbing inspections that catch sewer issues before a storm turns them into emergencies.
