LaPorte County, IN Noise Ordinances: Decibel Limits (2026)
Key Facts
- Governing section
- § 157.138(E)(9), Wind Energy Conversion Systems
- Measurement point
- 200 feet from any primary residence
- Loudest allowed band
- 75 dB at 63 Hz
- Quietest allowed band
- 41 dB at 8,000 Hz
- Meter standard
- ANSI-compliant octave band analyzer required
- Applies to
- Unincorporated LaPorte County only
Summary
LaPorte County's only numeric decibel standard in the zoning code targets wind energy conversion systems (WECS), not everyday household noise. Under § 157.138(E)(9), a turbine's sound pressure at 200 feet from any primary structure cannot exceed 75 decibels in the 63 Hz octave band, sliding down to 41 decibels at 8,000 Hz, measured with an ANSI-compliant octave band analyzer or sound level meter.
(9) Noise and vibration.
(a) Noise and vibration levels shall be in compliance with all county, state and federal regulations.
(b) At no point within 200 feet of a primary residence may the sound pressure levels from a wind turbine exceed the following sound levels. Sound levels shall be measured with an octave band analyzer or sound level meter and associated filer manufactured in compliance with standards prescribed by the National Standards Institute (ANSI). Octave Bands for LaPorte County in Maximum Permitted Sound Level (Decibels) Hertz (HZ) Measured 200 Feet from Edge of Any Primary Structure
63 75 125 70 250 65 500 59 1000 53 2000 48 4000 44 8000 41
Full Breakdown
Chapter 157's wind energy conversion system (WECS) rules apply within the unincorporated area of LaPorte County; incorporated cities like Michigan City and La Porte set their own noise limits. 138(B) requires anyone building, operating, or siting a WECS to first satisfy the entire section. Subsection (E)(9)(a) states noise and vibration levels must comply with all county, state, and federal regulations, and subsection (E)(9)(b) sets the actual ceiling: at no point within 200 feet of a primary residence may sound pressure levels from the turbine exceed the octave-band table printed in the ordinance, running 75 dB at 63 Hz, 70 dB at 125 Hz, 65 dB at 250 Hz, 59 dB at 500 Hz, 53 dB at 1,000 Hz, 48 dB at 2,000 Hz, 44 dB at 4,000 Hz, and 41 dB at 8,000 Hz.
Readings must come from an octave band analyzer or sound level meter built to National Standards Institute (ANSI) specifications, so a resident's own phone decibel app is not the enforcement standard. 138(D)(1)). 138(E)(12)(b)).
Violations & Fines
The code does not print a stand-alone WECS noise fine; enforcement runs through the Building Commissioner and the standard zoning nuisance-abatement track referenced in § 157.138(E)(12)(b), which lets the county order repair, rehabilitation, demolition, or removal once a turbine is declared unsafe or noncompliant. Owners planning a large WECS should keep post-construction octave-band readings on hand, since a documented exceedance is the trigger for that nuisance process.
Frequently Asked Questions
Does LaPorte County set decibel limits for everyday neighborhood noise?
How loud can a wind turbine be under this rule?
What happens if a turbine exceeds the noise table?
Sources & Official References
Other rules in LaPorte County
Compare LaPorte County to another location·View the Indiana noise ordinances overview
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