{
  "title": "Sewage Smell in the House — Who Do I Call, and Is It Dangerous?",
  "description": "Sewer smell from a drain, bathroom, or vent? Usually a $0 fix you can do in five minutes — a dried trap — before it's ever a plumber call. Where the smell comes from, in order of likelihood and cost.",
  "category": "water",
  "vertical": "plumbing",
  "tldr": "Start with the free fix: pour a quart of water into every drain you rarely use — floor drains, guest showers, basement sinks. A dried-out P-trap is the cause of most sewer smells and the water refills the seal in seconds. Smell persists → plumber, in order of suspicion: rocking or poorly sealed toilet (wax ring), blocked roof vent, or a cracked drain line. Rotten-egg smell near gas appliances is different — leave and call the gas company.",
  "who_to_call": [
    {
      "who": "Nobody yet — pour water into unused drains",
      "when": "Smell is near a floor drain, basement, laundry, or a bathroom nobody uses — dried traps cause most sewer smells and cost nothing to fix",
      "not_for": null
    },
    {
      "who": "Plumber",
      "when": "Smell survives the trap-refill test, follows one bathroom, or gets worse when water runs — wax ring, vent blockage, or drain crack territory",
      "not_for": "You haven't tried refilling the traps — you'd be paying a service call for a quart of water"
    },
    {
      "who": "Gas utility (from outside the house)",
      "when": "The smell is rotten eggs / sulfur near gas appliances rather than sewage — that's the gas odorant, not a drain. Leave first, call second",
      "not_for": "The smell is clearly drain-like and tied to bathrooms or fixtures"
    },
    {
      "who": "City sewer department",
      "when": "The whole neighborhood smells it outdoors, or smell arrives with gurgling drains after city work — the problem may be the main",
      "not_for": null
    }
  ],
  "costs": [
    {
      "item": "Plumber service call (diagnosis)",
      "range": "$50–$300",
      "source": "Fixr",
      "source_url": "https://www.fixr.com/costs/plumbing"
    },
    {
      "item": "Main sewer/drain line clearing (if a clog is the cause)",
      "range": "$350–$650",
      "source": "Fixr",
      "source_url": "https://www.fixr.com/costs/unclog-main-sewer-line"
    },
    {
      "item": "Camera inspection (find a cracked or blocked line)",
      "range": "$100–$800",
      "source": "Fixr",
      "source_url": "https://www.fixr.com/costs/unclog-main-sewer-line"
    }
  ],
  "faq": [
    {
      "q": "Is sewer gas actually dangerous or just gross?",
      "a": "At typical household levels it's mostly a nuisance — but it isn't nothing: sewer gas carries hydrogen sulfide and methane, and in enclosed spaces heavy concentrations can be harmful and flammable. A faint intermittent whiff is a plumbing puzzle; a strong persistent smell in a closed basement is a ventilate-now-and-fix-it-this-week problem."
    },
    {
      "q": "Why does the smell only show up when it's windy or cold?",
      "a": "Wind and temperature inversions push vent-stack exhaust back down toward the house, and cold snaps can frost-cap the roof vent shut. A smell that tracks weather rather than water use points at the vent stack, not the drains — still a plumber, but tell them the pattern; it saves diagnostic time."
    },
    {
      "q": "The smell is strongest in one bathroom after showers. What is it?",
      "a": "Classic wax ring failure at the toilet base — showers send a slug of water down shared drains, pressure pushes gas past the failed seal. A rocking toilet makes it near-certain. Wax ring replacement is a small, cheap plumber job, often bundled into the same visit as the diagnosis."
    },
    {
      "q": "Could it be a dead animal instead of sewage?",
      "a": "Different smell, commonly confused: sewage smells like drains; a dead animal smells sweetish-putrid and peaks then fades over about two weeks. If it's localized to one wall or the attic and no drain pattern fits, see our dead animal smell guide — that's wildlife removal or a handyman, not a plumber."
    }
  ],
  "sources": [
    {
      "label": "Fixr: Plumbing rates",
      "url": "https://www.fixr.com/costs/plumbing",
      "accessed": "2026-08-11"
    },
    {
      "label": "Fixr: Main sewer line clearing cost",
      "url": "https://www.fixr.com/costs/unclog-main-sewer-line",
      "accessed": "2026-08-11"
    }
  ],
  "updated": "2026-08-11",
  "url": "https://whodoicallfor.com/water/sewage-smell/",
  "json_url": "https://whodoicallfor.com/water/sewage-smell.json",
  "recommended_call": null
}