Rotten Eggs? Sulphur? Methane? Residents Ask: “What’s That Smell?”

Steel and Pulp Mills, Pennsylvania, 1930s

Well, no, it’s not as bad as it must have been living next to those steel and pulp mills back in the Way Back When but, whew, the locals are barking about a complex mix of aromas wafting through the 24/680 in recent days and we’ll confess – we don’t know what it is, though we’ve expounded on our suspicions.

No one else appears to know what it is, either, but that hasn’t stopped the Flash inquiries and “Where the hell is that smell coming from? posts of late.

For the record, we’re going with: Leaves, debris, and other detritus dumped into our culverts and sewers, dampened by recent rains and moldering into methane…

But YOU tell us what YOU think!

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12 Comments

  1. david on Sep 12, 2026 at 7:25 pm

    He rode a blazing saddle
    He wore a shining star
    His job to offer battle
    To bad men near and far
    He conquered fear and he conquered hate
    He turned our night into day
    He made his blazing saddle
    A torch to light the way

  2. Matt R. on Sep 13, 2026 at 8:17 am

    There’s apparently a sulfur spring somewhere near John Muir Hospital. A possible source for that area, anyway.

  3. Kleinart Family on Sep 13, 2026 at 11:27 am

    It’s kind of strange, neither organic or chemical. It seems to drift on the wind. I’d be interested in knowing the origin, if and when determined.

    • Chris Carver on Sep 13, 2026 at 12:27 pm

      It’s hydrogen sulfide gas coming from a natural spring on the church property across from John Muir medical center. It’s coming up through underground cracks. We seem to go through this every couple of years.

  4. Neighbor on Sep 13, 2026 at 12:10 pm

    I’m vaguely remembering a similiar situation a few years back.. and if i recall correctly the strong odor wafted over from the dump in Pittsburgh .

    • NEWS24-680 on Sep 13, 2026 at 12:21 pm

      Really? You mean our Pittsburg and not the other one, right… ’cause that would be a bit of a stretch. But if borne out that would be a new contender in the “explanations” race.

      • Neighbor on Sep 14, 2026 at 3:53 pm

        Lol…that would be something!

  5. A.J. Sheffield on Sep 13, 2026 at 2:13 pm

    So there’s some gas pockets bubbling up under Walnut Creek?

  6. L. Alvarez on Sep 14, 2026 at 5:20 am

    Yes. This has been ongoing for the past few weeks. We have seen fire department and other persons checking out sewers and other areas in the neighborhood late at night. Its very odd and the odor seems to be traveling.

  7. DB on Sep 14, 2026 at 7:00 am

    I am in Orinda I called PG&E they had people out all over trying to triangulate something in the sewers it was not gas

  8. Jennifer on Sep 14, 2026 at 8:00 pm

    Natural gas leak or sewer gas.

  9. david on Sep 16, 2026 at 6:05 pm

    Gas is gas or as they used to say in the 1984 Wendy’s commercial in reference to chicken ingredient parts, “parts is parts”

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