Simi Valley Brownfield Testing & Cleanup Guide

Environmental Protection California 4 Minutes Read · published February 21, 2026 Flag of California

Simi Valley, California property owners face specific responsibilities when a site may be contaminated by past industrial or commercial uses. This guide explains municipal and agency roles, common testing steps, required permits for redevelopment, and how enforcement and cleanup are coordinated so owners can manage risk and redevelopment. Where city ordinances or forms are not explicit, owners should expect coordination with Ventura County environmental programs and state or federal cleanup authorities for brownfield assessment and remediation. Follow the action steps below to start a compliant assessment, secure permits, and address enforcement risks.

Understanding Brownfields and Responsibilities

Brownfields are properties where redevelopment or reuse may be complicated by the presence or potential presence of hazardous substances, pollutants, or contaminants. Property owners in Simi Valley must perform due diligence before sale, lease, or redevelopment; typical due diligence includes a Phase I Environmental Site Assessment and, if indicated, Phase II sampling and a remediation plan. Local land-use review and building permits intersect with environmental review under municipal procedures and state cleanup laws[1].

Begin with a Phase I ESA to document historical uses and trigger next steps.

Assessment and Testing

Testing is usually performed by licensed environmental consultants. Key steps include:

  • Phase I Environmental Site Assessment (records review, site reconnaissance, interviews).
  • Phase II investigation (soil, groundwater, vapor sampling) if Phase I finds REC(s) - Recognized Environmental Conditions.
  • Remedial Investigation/Feasibility Study where required by oversight agencies.
  • Prepare a cleanup plan and schedule if contamination requires remediation.

Penalties & Enforcement

Enforcement and penalties for contamination, failure to report releases, or noncompliant cleanup involve multiple authorities. Specific fine amounts and per-day penalties are not specified on the cited municipal pages; enforcement is typically carried out by county, state, or federal agencies depending on the contamination and jurisdiction[1]. For sites that pose public health or groundwater risks, the California Department of Toxic Substances Control and the U.S. EPA may have oversight or funding programs for cleanup[2][3].

  • Monetary fines: not specified on the cited municipal page; amounts depend on the enforcing agency and statutory framework.
  • Escalation: initial notices, administrative orders, escalated penalties, and mandatory remediation—specific escalation schedules are not specified on the cited municipal page.
  • Non-monetary sanctions: cleanup orders, site access orders, liens, injunctive relief, and court enforcement may be applied by state or federal agencies.
  • Enforcers and inspection: local code or planning staff coordinate with Ventura County environmental health (CUPA), the California DTSC, and the EPA for site inspections and oversight.
  • Appeal/review: appeal routes vary by agency; time limits for administrative appeals are set by the enforcing agency and are not specified on the cited municipal pages.
If you receive a civil or administrative order, contact environmental counsel and the enforcing agency promptly.

Applications & Forms

There is no single city brownfield cleanup application published on the municipal pages; owners typically must submit consultant reports with permit or discretionary land-use applications and coordinate with county or state cleanup programs. Common submissions include:

  • Phase I and Phase II reports (prepared by licensed consultants) submitted with planning or building permits.
  • Permit or plan-check fees charged by Building & Safety when redevelopment triggers grading, demolition, or construction permits.
  • Consult with Ventura County Environmental Health or the California DTSC for program-specific forms and grant applications for brownfields cleanup or assessment.
Most cleanup work requires an approved plan and oversight from a regulatory agency before closure letters are issued.

Action Steps for Owners

  • Order a Phase I ESA immediately when considering purchase or redevelopment.
  • If Phase I shows potential issues, commission a Phase II investigation and share results with the local planning department during entitlement review.
  • Apply for any required building, grading, demolition permits and attach environmental reports as required by City staff.
  • If ordered to clean up, communicate with the enforcing agency to learn appeal deadlines and compliance timelines.

FAQ

Do I need to disclose contamination when selling property in Simi Valley?
Yes; sellers must follow state and federal disclosure laws and should complete environmental due diligence to identify known contamination.
Who enforces cleanup orders for contaminated sites?
Enforcement depends on the contamination: Ventura County environmental health, the California DTSC, or the U.S. EPA may each have jurisdiction depending on site conditions and contaminants.
Are there grants or funding programs for brownfield cleanup?
State and federal brownfields programs may offer assessment or cleanup grants; eligibility and application requirements vary by program.

How-To

  1. Hire a qualified environmental consultant to conduct a Phase I Environmental Site Assessment.
  2. If recommended, commission Phase II testing (soil, groundwater, vapor) and obtain a written report.
  3. Consult the City planning or building department early to identify permit requirements and submittal expectations.
  4. If contamination is confirmed, prepare a remediation plan and submit it to the relevant regulatory agency for approval.
  5. Complete remediation under agency oversight, obtain closure or no-further-action documentation, and record any required notices or covenants.

Key Takeaways

  • Start environmental due diligence early to avoid delays in transactions and permitting.
  • Coordination among City, County, and State agencies is common; know your lead regulator.
  • Penalties and remediation costs vary by agency and statute; specific fine amounts are not listed on city pages.

Help and Support / Resources

  1. [1] City of Simi Valley Municipal Code and municipal pages for planning/building
  2. [2] California Department of Toxic Substances Control - Brownfields
  3. [3] U.S. EPA Brownfields Program

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