What should you ask about SSFL when buying in Simi Valley?

If you’re buying a home in Simi Valley and see a headline about the Santa Susana Field Laboratory, start by identifying which part of the site the story concerns. Ask the seller and agent what they know, read the disclosure documents you receive, and check the cleanup record with the responsible agency. A site headline doesn’t establish facts about a particular home.

This is general information and not legal advice.

What does the latest demolition story say?

The Simi Valley Acorn reports Boeing is demolishing five former research buildings in Area IV, most already down, the rest expected by year’s end, and that the work has drawn scrutiny.

That is the limited account used here from the Acorn’s October 30, 2026, coverage. The article names no Simi Valley neighborhoods. Its expected demolition timing shouldn’t be read as a completion date for cleanup across the field laboratory.

For your purchase research, keep the activity and ownership area attached to the headline: Boeing, Area IV, demolition. Those details help you avoid treating a report about one portion as an update on every portion.

Demolition, soil cleanup and groundwater cleanup have separate records. Before carrying a statement from one document into another question, check what work the statement actually describes.

Which sources support the cleanup information here?

The cleanup information here comes from the National Aeronautics and Space Administration’s own SSFL website, read on October 30, 2026.

Source status as of October 30, 2026: the City of Simi Valley website returned 403 Access Denied, and the California Department of Toxic Substances Control website displayed a browser check. Neither was bypassed. DTSC’s cleanup decision documents and the City’s municipal code and agenda were not read.

NASA identifies DTSC as the regulatory agency overseeing cleanup. Check DTSC’s SSFL page directly for current status and the State’s decision documents.

That access limitation matters. A NASA description of a State approval is attributed here to NASA; it isn’t presented as an independent review of the underlying DTSC document. Likewise, nothing here establishes a City rule governing your purchase. Keep those distinctions when discussing the records with your agent.

Who owns which parts of SSFL?

The U.S. government owns about 450 acres administered by NASA, while Boeing owns the rest, according to NASA’s home page.

NASA’s portion includes Area II, at 409.5 acres, and a 41.7-acre parcel in Area I. Most of Area I, Areas III and IV, and the undeveloped lands are owned by Boeing. Boeing leased a portion of Area IV to the Department of Energy, or DOE.

NASA’s home page describes SSFL as a site covering 2,850 acres and says rocket engine development and testing occurred from the 1950s until 2006. Its Environmental Setting page places the site near the crest of the Simi Hills. The FAQ says the facility opened in 1948 and the last engine test occurred at the Alfa Test Area in 2006.

For document review, ownership is a practical sorting tool. An update about land administered by NASA doesn’t establish Boeing’s or DOE’s cleanup status. Check the area before relying on the update.

What agreements govern NASA’s cleanup work?

NASA describes a 2007 Consent Order for Corrective Action and a 2010 Administrative Order on Consent as governing documents for its cleanup work.

According to NASA’s cleanup page, NASA, Boeing, DOE and DTSC signed the Consent Order in August 2007. It covers soils and groundwater and requires groundwater cleanup based on risk.

In December 2010, NASA entered the Administrative Order on Consent, or AOC, with DTSC for soils in areas administered by NASA. NASA says that agreement requires cleanup to the values in the Look-up Table established by DTSC in 2013.

When you read an update, identify which agreement and which work it addresses. A soil requirement and a groundwater approval answer different questions. The presence of an agreement also doesn’t tell you that implementation has begun.

Ask for the document’s title and issuing agency when a statement about cleanup comes up. That gives you something specific to check against the agency record.

Where does NASA say soil and groundwater work stand?

NASA reports completed soil investigation work and approved groundwater planning steps, with further decisions or approvals needed before the cleanup activities described can begin.

On its soil cleanup page, NASA says DTSC approved its comprehensive soil investigation in 2019. NASA issued its soil Record of Decision in 2020. It says it is working with DTSC to resolve technical issues so final, comprehensive cleanup can begin once the State issues decision documents, identified as the Programmatic Environmental Impact Report. The pages read give no start date.

For groundwater, NASA issued a Record of Decision in 2018 and describes two phases. NASA says DTSC approved the Phase I Corrective Measures Study and issued the Final Statement of Basis in January 2026.

NASA is developing the Phase 1 Corrective Measures Implementation Plan. Once that plan is approved, NASA can begin Phase 1 groundwater cleanup. As of the October 30, 2026, reading, that remains the sequence NASA describes.

How does NASA’s demolition work differ from Boeing’s?

NASA’s demolition updates concern areas administered by NASA, while the Acorn report concerns Boeing’s Area IV buildings.

NASA’s FAQ says it completed Phase 7 in 2024 and Phase 6, involving Coca Test Stand 1, in 2026. It says NASA is preparing Phase 8, the final planned demolition phase in its areas before cleanup.

The FAQ and demolition page differ on phase numbering order; the sequence above follows the FAQ. NASA also says it decided in 2020 to retain the two remaining Alfa Test Stands and the Alfa control house.

Future use remains unresolved. NASA submitted a report of excess to the General Services Administration in 2009, which conditionally accepted it pending cleanup completion. NASA says the final use of its portion is not yet known, though it expects eventual preservation as open space. Treat that as an expectation, not a settled outcome for land use.

What should you ask during a home purchase?

Ask the seller and agent what they know, and read the Natural Hazard Disclosure and seller disclosure documents you receive.

The California seller disclosure guide provides general background for that review. NASA’s pages don’t describe disclosures for a particular Simi Valley property or establish a requirement to tell buyers about SSFL. They also say nothing about Simi Valley home values.

For broader context, the South Gate buyer guide about a cleanup site concerns another city and another site. The former ordnance location disclosure guide explains a different disclosure rule; it doesn’t establish that the rule applies to SSFL.

A Simi Valley buyer asked us whether the property’s distance from the Santa Susana Field Laboratory was enough to dismiss his concerns. We did not try to answer an environmental question from a map or from neighborhood opinions. We helped him identify the official cleanup information and the specific questions he wanted answered before continuing with the purchase.

The short version

Your next step is to match each statement to its ownership area, document and agency before drawing conclusions about a purchase.

The October 30, 2026, Acorn story concerns Boeing demolition in Area IV. NASA’s pages describe NASA’s work and identify DTSC as the cleanup regulator. The NASA records read leave further soil decisions and groundwater implementation approval pending.

Check DTSC directly for current status. Ask the seller and agent what they know, and read the disclosure documents you receive. Keep your property questions separate from assumptions about the site’s future use or cleanup schedule.

NASA’s pages provide no basis for a conclusion about a particular home’s value. For a separate starting point on that question, use the home value tool.