85 local rules on file · Pop. 1,255 · Contra Costa County
Showing ordinances that apply to Diablo, CA
Diablo is an unincorporated community with a population of approximately 1,255 in Contra Costa County, California. Because Diablo is not an incorporated city, it does not have its own municipal government or city code. Instead, Contra Costa County ordinances apply directly to residential and commercial properties here. The rules below are the county-level regulations that govern your area. Nearby incorporated cities in Contra Costa County may have different rules.
Open burning is prohibited in unincorporated Contra Costa County except under a narrow set of agricultural or hazard-reduction permits. Residential yard waste burning is banned year-round under BAAQMD Regulation 5, and wood smoke advisories add further restrictions during winter Spare the Air alerts.
Properties in State Responsibility Areas and Very High Fire Hazard Severity Zones across unincorporated Contra Costa must maintain 100 feet of defensible space under Public Resources Code 4291. ConFire conducts annual inspections in the WUI, and non-compliance can trigger abatement, liens, and fines starting at $100 and escalating to misdemeanor charges.
These unincorporated areas are also governed by Contra Costa County ordinances.
Every dwelling in unincorporated Contra Costa must have working smoke alarms in each bedroom, outside every sleeping area, and on every floor per California Health and Safety Code 13113.7 and CRC R314. Alarms installed after 2015 must be 10-year sealed-battery or hardwired with battery backup, and carbon monoxide alarms are also required.
Contra Costa County Agricultural Commissioner enforces state noxious weed lists under Food & Ag Code 5004, targeting yellow starthistle, artichoke thistle, purple loosestrife, and other A/B-rated species. Property owners can be ordered to abate noxious weeds and billed for county removal under the weed abatement ordinance.
New and rehabilitated landscapes over 500 sq ft in unincorporated Contra Costa must comply with the Model Water Efficient Landscape Ordinance (MWELO). Rebates for lawn-to-xeriscape conversions are available through EBMUD and CCWD, and HOAs cannot prohibit drought-tolerant landscaping under Civil Code 4735.
Unincorporated Contra Costa requires weeds and dry vegetation to be cut to 3 inches or less in developed areas and 4 inches in rural/wildland areas under the county weed abatement program. The fire marshal issues annual abatement notices each April and contracts out clearing at owner cost plus administrative fees if not completed.
Contra Costa County protects heritage and native trees under County Ordinance Code Chapter 816-6. A permit is required to remove any protected tree (most native oaks, bays, buckeyes, madrones, and sycamores) of 6.5 inches DBH or larger on private property. Unpermitted removal carries penalties up to $10,000 per tree plus replacement planting.
Permanent statewide water waste rules and water district schedules apply in unincorporated Contra Costa. EBMUD and Contra Costa Water District limit landscape irrigation to set days and hours, prohibit runoff and daytime watering, and can impose excessive-use penalties up to $2 per extra unit plus surcharges during droughts.
All pools in unincorporated Contra Costa County must comply with the California Swimming Pool Safety Act (Health & Safety Code 115920-115929). Pools built or remodeled after January 1, 2018 require at least two approved drowning prevention safety features, with a 60-inch barrier being the most common.
All pool and spa drains in Contra Costa County must comply with the federal Virginia Graeme Baker Pool & Spa Safety Act and California Health & Safety Code 116064, requiring anti-entrapment drain covers and, for single-drain pools, secondary anti-entrapment systems such as a safety vacuum release system.
Commercial vehicle parking in unincorporated Contra Costa County is restricted on residential streets and lots under Ordinance Code Title 4, Division 46. Vehicles over specified weight thresholds cannot be parked overnight in residential zones without a permit.
Unincorporated Contra Costa County regulates street parking under California Vehicle Code and Ordinance Code Title 4, Division 46. The statewide 72-hour limit (CVC 22651(k)) applies on county roads, with additional posted restrictions for street sweeping and permit zones.
Unincorporated Contra Costa County limits RV and boat parking on streets and private property under Ordinance Code Title 4 and zoning provisions. RVs generally cannot be stored in front yards or used as permanent residences, and street parking is limited to 72 hours under CVC.
Livestock (cattle, horses, goats, sheep, pigs) is allowed in unincorporated Contra Costa County's agricultural and large-lot residential zones with setbacks and density limits in the county zoning code. Urban and suburban areas generally prohibit livestock.
All dogs 4 months and older in unincorporated Contra Costa County must be licensed annually and vaccinated against rabies. Dogs must be leashed in public and may not run at large. Contra Costa Animal Services in Martinez and Pinole enforces.
Beekeeping is allowed in most unincorporated Contra Costa County residential and agricultural zones subject to hive setbacks (typically 10–20 feet from property lines) and registration with the County Agricultural Commissioner. Africanized-bee incidents trigger mandatory requeening.
Unincorporated Contra Costa County generally allows up to 4 dogs and 4 cats per residential parcel without a kennel permit. Exceeding these limits or operating a boarding/breeding business requires a kennel permit from Animal Services and proper zoning.
Exotic and wild animals are broadly prohibited in unincorporated Contra Costa County. California Fish and Game Code restricts ownership of venomous snakes, big cats, primates, and most non-domestic species. Permits through CDFW are rare and tightly limited.
Backyard chickens are allowed in most unincorporated Contra Costa County residential and agricultural zones, typically with 4–6 hens per parcel, no roosters in residential zones, and coop setbacks of 20–40 feet from dwellings. Agricultural zones allow higher counts.
Wildlife in unincorporated Contra Costa County is regulated primarily by California Department of Fish and Wildlife (CDFW). It is illegal to feed deer, coyotes, raccoons, or wild turkeys. Depredation permits are required to remove protected wildlife damaging property.
Contra Costa County uses a behavior-based dangerous-dog process under Chapter 416 and California Food & Agricultural Code §31601 et seq. Dogs declared potentially dangerous or vicious face confinement, insurance, muzzling, and signage requirements. Breed-specific bans are preempted by state law.
Contra Costa County Noisy Animal Ordinance (Code §416-12.202) makes it unlawful to have an animal that creates noise for 30 continuous minutes (incessant) or 60 minutes off and on in 24 hours (intermittent). Responsible persons can be fined.
Unincorporated Contra Costa County generally observes quiet hours from 10:00 PM to 7:00 AM, during which loud residential noise (parties, amplified music, power equipment) is prohibited. The county relies on the reasonable-person standard in Title 716 rather than a fixed nighttime decibel cap.
Vehicle noise in unincorporated Contra Costa County is governed primarily by California Vehicle Code §§27150–27207 (muffler requirements, modified exhaust, and amplified sound). The Sheriff's Office and CHP enforce; fines for modified exhaust or loud stereos start around $200.
Construction noise in unincorporated Contra Costa County is typically limited to 7:00 AM – 7:00 PM Monday through Friday and 8:00 AM – 5:00 PM on Saturday, with no construction on Sunday or federal holidays. Building permits may impose tighter limits for sensitive areas.
Amplified music in unincorporated Contra Costa County is regulated under Title 716. Outdoor speakers, live bands, and DJ equipment must not produce sound plainly audible inside a neighboring home and are prohibited during 10 PM–7 AM quiet hours without a special-event permit.
Gas and electric lawn equipment in unincorporated Contra Costa County may generally be operated between 7:00 AM and 7:00 PM on weekdays and 8:00 AM to 5:00 PM on weekends. Outside those hours, operation is a noise-ordinance violation under Title 716.
In unincorporated Contra Costa County, residential fences may be up to 6 feet tall in side and rear yards and typically 3 to 4 feet in front yard setbacks. Fences over 6 feet require a building permit. Corner-lot visibility triangles further restrict height.
Retaining walls over 3 to 4 feet of retained earth require a building permit and engineered design in unincorporated Contra Costa County. Walls with surcharge (buildings, driveways, slopes above) typically require a permit at any height. Setbacks and drainage must meet county grading standards.
Unincorporated Contra Costa County allows wood, vinyl, composite, masonry, stucco, wrought iron, and chain-link fencing in most residential zones. Some community-specific design standards in Alamo, Kensington, and Saranap restrict certain materials by front-yard visibility and aesthetics.
Hedges and living screens in unincorporated Contra Costa County are generally treated as landscaping and are not subject to the same permit thresholds as fences, but height limits in corner-lot visibility triangles and spite-fence rules (Civil Code §841.4 over 10 feet) still apply.
Swimming pool barriers in Contra Costa County must follow California Health & Safety Code §115920 et seq. Pools built or remodeled after 2007 must have at least 2 safety features. Barriers must be at least 60 inches tall with self-closing, self-latching gates opening away from the pool.
In unincorporated Contra Costa, a detached one-story accessory building used as a tool/storage shed of 120 sq ft or less does not require a building permit. Zoning setbacks still apply—typically 3 feet from side/rear property lines in R-zones—and any shed with electrical or plumbing needs a permit.
Contra Costa County allows one ADU and one JADU on any residential lot by ministerial permit, consistent with AB 68/AB 881 and Gov. Code 65852.2. Detached ADUs up to 800 sq ft with 4-foot setbacks are permitted as of right, with 60-day review, no impact fees under 750 sq ft, and no replacement parking required near transit.
Attached and detached garages in unincorporated Contra Costa must meet zoning setbacks and building code fire separation (1/2-inch gypsum from dwelling). Garages cannot be converted to living space without a permit, though garage-to-ADU conversions are streamlined under state law with no replacement parking near transit.
Carports in unincorporated Contra Costa County are regulated as accessory structures under Title 8 (Zoning) of the County Ordinance Code and as covered structures under the California Building Code as adopted by the county. A carport must satisfy the yard-setback rules of the underlying residential zoning district (e.g., R-6 single-family per Chapter 84-4) and requires a building permit. The county's STR ordinance separately requires off-street parking and may restrict use of carports for STR guest parking.
County home-occupation rules bar customers, clients, or students from visiting the residence for business purposes. Exceptions are narrow (family daycare under state law) and most client-facing businesses must operate from a commercial location in unincorporated Contra Costa.
Small family day care homes (up to 8 children) and large family day care homes (up to 14 children) are protected by California Health & Safety Code sections 1597.30-1597.622. Contra Costa County cannot prohibit them in residential zones and must treat them as residential uses for zoning purposes.
Commercial signage advertising a home occupation is prohibited in unincorporated Contra Costa under Ordinance Code Chapter 82-4. The residential appearance of the dwelling must be preserved with no signs, window displays, banners, or external evidence of a business.
Home occupations in unincorporated Contra Costa require a Home Occupation Permit under Ordinance Code 82-4.242. The business must be secondary to the residential use, conducted entirely within the dwelling, use no more than 25% of the floor area, and generate no customer traffic, outside employees, or external evidence of commercial activity.
Contra Costa County does not set a county-wide explicit per-night occupancy cap for STRs, but general building code occupancy standards apply. Uniform Housing Code and California Building Code limit occupants based on bedroom count and square footage, typically 2 per bedroom plus 2 additional guests.
STR parking in unincorporated Contra Costa County must comply with the residential zone's parking standards, typically 2 off-street spaces for a single-family home. On-street parking follows the California Vehicle Code 72-hour rule and any local no-parking designations.
Contra Costa County imposes a 10% Transient Occupancy Tax on short-term rentals (stays under 30 days) in the unincorporated area. Operators must register, collect the tax, and remit it monthly or quarterly to the Treasurer-Tax Collector. Airbnb collects and remits TOT directly for qualifying bookings.
Contra Costa County requires operators of short-term rentals in unincorporated areas to register with the Treasurer-Tax Collector for Transient Occupancy Tax purposes. STR operators must obtain a TOT certificate and business license, and some areas require additional land use permits depending on zoning.
Unincorporated Contra Costa County regulates short-term rentals under Chapter 88-32 of the County Ordinance Code (added by Ordinance 2020-12). The STR operating standards prohibit excessive noise inconsistent with residential use. The ordinance does not set a specific decibel limit or fixed quiet-hour window; instead it pairs that standard with a hard 20-person gathering cap and a ban on weddings, conferences, and other commercial special events.
Unincorporated Contra Costa County does not require short-term rental operators to carry a county-mandated minimum liability insurance policy. The Chapter 88-32 STR ordinance (added by Ordinance 2020-12) and the county's published STR application materials regulate registration, occupancy, parking, and operating standards but do not impose a $500K or $1M liability floor of the kind seen in some California cities.
Short-term rentals in unincorporated Contra Costa County require a permit from the Department of Conservation and Development under Ordinance No. 2020-12. ADUs may not be used as short-term rentals. A 10% Transient Occupancy Tax applies.
Illicit discharges to the storm drain system are prohibited in unincorporated Contra Costa County under Ordinance Code Chapter 1014-6 and the Municipal Regional Stormwater NPDES Permit. Violations carry administrative fines, cleanup costs, and potential prosecution.
Unincorporated Contra Costa County regulates floodplain development under Ordinance Code Chapter 914-14 to maintain FEMA National Flood Insurance Program (NFIP) participation. Significant AE flood zones affect Bethel Island, Bay Point, Rodeo, and delta shoreline areas.
HOAs in Contra Costa County may impose fines for CC&R violations only after adopting a schedule of monetary penalties, providing notice, and holding a disciplinary hearing per Civil Code 5850-5855. Fines must be reasonable, proportionate, and properly recorded. Unpaid fines generally cannot create liens except for assessments.
HOAs in Contra Costa County operate under the California Davis-Stirling Common Interest Development Act (Civil Code 4000-6150). HOA rules may be stricter than county code but cannot conflict with state law or county health and safety requirements. The county enforces public law; HOAs enforce CC&Rs.
Disputes between HOAs and owners in Contra Costa County are governed by Davis-Stirling (Civil Code 5900-5965) requiring Internal Dispute Resolution, with Alternative Dispute Resolution (mediation/arbitration) required before filing most lawsuits. Superior Court has jurisdiction for litigation.
Food truck operators in unincorporated Contra Costa County require a Contra Costa Environmental Health Mobile Food Facility permit and a Business License. Statewide preemption under SB 972 (2022) limits local restrictions on sidewalk food vendors.
Mobile food facility location restrictions in unincorporated Contra Costa County are limited by state preemption (SB 972). Operators generally must have landowner permission, respect zoning, maintain setbacks from residences and schools, and cannot block ROW.
Federal Title X and California Health & Safety Code require lead paint disclosure for pre-1978 rental units in unincorporated Contra Costa County. Landlords must provide EPA pamphlet and disclosure form before lease signing.
California Civil Code Section 1940.9 and Health & Safety Code Section 26147 require landlords to disclose known visible mold to prospective tenants. Contra Costa County follows state law with no supplemental local mold ordinance.
Unincorporated Contra Costa County does not operate a mandatory rental registration program for single-family or small multi-family rentals. Landlords are subject to state requirements including AB 1482 rent cap, Tenant Protection Act, and general business tax filings.
Electrical permits are required in unincorporated Contra Costa County for most work beyond minor repairs. The county Building Inspection Division enforces the California Electrical Code (Title 24 Part 3, based on NEC). Permit exemptions apply to simple like-for-like replacements and low-voltage work.
California Health & Safety Code 13113.7 and the California Residential Code require working smoke alarms in all dwelling units in Contra Costa County. Alarms are required in each sleeping room, outside each sleeping area, and on every level including basements. Alarms manufactured after 2015 must have a 10-year sealed battery.
California Health & Safety Code 13260-13263 (Carbon Monoxide Poisoning Prevention Act of 2010) requires CO alarms in all dwelling units with fossil-fuel appliances, fireplaces, or attached garages. Alarms must be installed outside each sleeping area and on every level of the home.
Unincorporated Contra Costa County requires building permits for reroofing projects under the California Building Code as adopted in County Ordinance Code Title 7. Class A fire-rated roofing assemblies are required in WUI and VHFHSZ areas (Title 7, Chapter 74-6).
Plumbing permits are required in unincorporated Contra Costa County for new installations, alterations, water heater replacements, and sewer lateral work under the California Plumbing Code adopted in Title 7 of the County Ordinance Code. Permits are issued by the DCD Building Inspection Division.
Hauler-issued carts only; lids must remain closed and waste contained. Overfilled, damaged, or non-franchise containers will not be serviced. Extra bags require pre-paid tags.
Franchised residential customers receive one to two free bulky item pickups annually (appliances, furniture, mattresses). Schedule through hauler with at least one week notice; six-item limit per pickup typical.
Unincorporated Contra Costa County uses franchised haulers (Republic Services, Mt. Diablo Recycling) with assigned weekly collection days by route. Carts must be curbside by 6 AM on service day and removed within 24 hours.
Contra Costa County Code Chapter 418-10 and Penal Code 374.3 make illegal dumping a misdemeanor with fines up to $10,000, possible jail time, and mandatory cleanup costs. County operates illegal dumping hotline.
SB 1383 mandates organics recycling for all residents and businesses. Contra Costa County requires separation of recyclables (blue cart) and organics including food scraps (green cart) with enforcement beginning 2024.
Political signs receive same treatment as other non-commercial signs — up to 6 sq ft, no permit, on private property with owner consent. Content-neutral after Reed v. Gilbert; cannot single out election signs.
Garage sale signs permitted on private property with owner permission; not allowed in public right-of-way. Must be removed promptly after sale concludes. Size limits match general residential signs (6 sq ft).
Contra Costa County Code Chapter 54-4 imposes a curfew on minors under 18 from 10 PM to 5 AM in unincorporated areas, with exceptions for accompanied minors, emergencies, and First Amendment activity.
Contra Costa County parks close from sunset (or 10 PM) to 6 AM unless special use permitted. Violation is infraction under CCC Chapter 1110-6 with fines up to $250 per CA Public Resources Code.
Contra Costa County does not maintain a formal no-knock registry. Residents enforce solicitor restrictions by posting 'No Soliciting' signs, which are enforceable under CCC Chapter 54-6 and trespass law.
CCC Code Chapter 54-6 regulates door-to-door solicitors. Commercial solicitors must obtain a County permit and carry photo ID. Hours limited to 9 AM to sunset. No-soliciting signs must be honored.
Unincorporated Contra Costa County does not require a permit for residential garage sales. No registration fee or application — residents may hold sales on their own property with basic sign and parking compliance.
No formal frequency cap on garage sales in unincorporated CCC, but repeated sales may trigger classification as home business or unlicensed retail under Zoning Code Title 88. Industry norm: 2-4 per year per address.
Unincorporated Contra Costa County regulates outdoor lighting through Ordinance Code Title 8 zoning provisions and CEQA review, with stricter standards near Mt. Diablo and in rural residential areas. No comprehensive county-wide dark-sky ordinance, but shielded fixtures are commonly required.
Light trespass and glare onto adjacent properties in unincorporated Contra Costa County is prohibited under Ordinance Code Title 8 nuisance and zoning provisions. Commercial and multi-family projects must meet foot-candle limits at property lines through CEQA lighting review.
Unincorporated Contra Costa County issues residential solar permits through the SolarAPP+ online platform in compliance with AB 2188 (3-day expedited processing). Permits are required for photovoltaic and solar-thermal installations under Title 7 of the County Ordinance Code.
Homeowner association restrictions on rooftop solar in unincorporated Contra Costa County are governed by California Civil Code 714 (Solar Rights Act). HOAs cannot effectively prohibit or significantly limit residential solar installations.