Bostonia, CA Outdoor Lighting: Dark Sky Rules (2026)
Key Facts
- Authority
- San Diego County (unincorporated)
- Ordinance
- Light Pollution Code
- Protects
- Palomar, Mount Laguna observatories
- Bostonia zone
- Zone B (outside 15-mile radius)
- Applies to
- Lighting after Jan. 1, 1985
Summary
San Diego County has a real dark-sky ordinance, the Light Pollution Code, to protect the Palomar and Mount Laguna observatories. Bostonia sits in Zone B (outside the 15-mile observatory radius), where outdoor lighting installed after Jan. 1, 1985 must be shielded and low-glare, though Zone B limits are less strict
The purpose of this chapter is to minimize light pollution to allow citizens of the County to view and enjoy the night environment and to protect the Palomar and Mount Laguna observatories from the detrimental effect that light pollution has on astronomical research.
Full Breakdown
Because Bostonia is unincorporated, it is covered by the County Code of Regulatory Ordinances Light Pollution Code (Sec. 51.201 et seq.). The Code divides the County into Zone A (within a 15-mile radius of Palomar and Mount Laguna observatories) and Zone B (everywhere else, including Bostonia). Its purpose is to minimize light pollution so residents can enjoy the night sky and to protect astronomical research at the observatories. All artificial outdoor luminaires installed or reinstalled after January 1, 1985 must comply, using shielded, low-pressure or otherwise controlled fixtures. Zone A imposes stricter lamp-type and curfew limits; Zone B still requires shielding to reduce sky glow.
Violations & Fines
Non-conforming outdoor lighting is a code violation abatable by the County; owners may be required to shield or replace fixtures.
Frequently Asked Questions
Does Bostonia have a dark-sky ordinance?
Is Bostonia in the strict observatory zone?
Sources & Official References
Other rules in Bostonia
California rules heatmap·Compare Bostonia to another location·View the California outdoor lighting overview
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Dark Sky Rules in Nearby Cities
How other cities in San Diego County handle dark sky rules.