As you are aware the odor issue is due to the city dump, sea water, and the salt ponds.
When you bought the house you did read, review and sign the Natural Hazards Disclosure.
If the NHD had a FEMA map with different zones coded and you signed it, it should not be a surprise.
If the color was blue, and you were asked to get flood insurance then clearly you are in the flood zone.
Off course, 5 years from now due to global warming the bay rises then you likely do flood.
What iff, etc, future does not help.
1. The proximity to the shoreline at the bottom of the tip of the bay,
2. The waste treatment facility.
Iâ€™ve smelled both of these on various occasions close to I-880, but the further east you go, the less chance there is of any prevailing odors.
The builder has a copy of the Natural Hazard disclosure which you can get by asking them.
Iâ€™d recommend you have a Realtor represent you â€“ since you are asking for this information in this forum from Realtors, imagine how helpful an experienced Realtor can be on other issues pertaining to the purchase of a new home. Weâ€™re represented many buyers purchasing new homes, and theyâ€™ve been very happy with the results.
As for a waste treatment facility in Newark as suggested by Tina, there isnâ€™t one.
You'll have to check with the builder to see what type of flood zone the community is in.