Ordinance

In SimCity 4, there are exactly 20 ordinances which you can enact and 19 have an effect on your city. All ordinances are predefined in the game's executable, existing ordinances can be replaced or modified to a certain degree, but new ordinances cannot be added due to this limitation.
Ordinances have their own Type and Group IDs, 6534284A and A9C2C209 respectively. Every language has a separate name for each ordinance, the ones in the table below are from the UKEnglsh version of Simcity 4 and listed in alphabetical order of their Exemplar Names, as listed in SimCity1.dat.

There are two known unused properties in the Ordinances, the year they became available in (presumably) an Alpha version of the game and only edited from 0 in the Power Conservation Act and the "Monthly Chance", which is set to 0.5 in all Ordinances.

City eligibility for ordinances is re-evaluated every month.

Availability

All ordinances become available after one in-game month, except four, which have prerequisite buildings which must be built first. Their in-game names and their required buildings are listed both below and in the table.

• Junior Sports Programs (Park)
• Landfill Gas Recovery Program (Landfill + Gas Power Plant)
• Neighborhood Watch Program (Police Station)
• Trash Presort Requirement (Recycling Center)

Benefits, detriments and costs

This table contains all of the ordinances in the game defined by Maxis and their effects. In-Game names are as they appear in the UKEnglsh (British English) version of the game.
Mayor Rating alterations are not in percent, as the Mayor Rating is defined as a number from 1 to 255, and subtract from that number. For example, "Decreased by 5" means the Mayor Rating is decreased by exactly 5, not 5%.

IID	Exemplar Name	In-Game Name	Properties
C2BF1E04	Car Smogging	Automobile Emission Reduction Act	Enactment Cost §20 Retractment Cost §10 Monthly Cost §20 + §0.005 per person Air Pollution Decreased by 10% Mayor Rating Decreased by 5 Note: The way Maxis orignally defined this ordinance, it has no effect on vehicle pollution, instead effecting general pollution, such as that from Factories. The NAM includes a repaired version of this Ordinance which does lower vehicle pollution (Decreased by 40%)
A2BF1DDC	Carpool Incentive	Carpool Incentive Program	Enactment Cost §10 Retractment Cost §10 Monthly Cost §50 + §0.010 per person Note: This ordinance is incomplete and has no effect. This literally does no function except cost you money.
A2BF1E43	Clean Air	Clean Air Act	Enactment Cost §20 Retractment Cost §10 Monthly Cost §50 + §0.005 per person Air Pollution -10% Dirty Industry Demand Decreased by 33%
00D0723D	CPR Training	Community CPR Training Program	Enactment Cost §10 Retractment Cost §10 Monthly Cost §50 + §0.005 per person Health Quotient Increased by 10%
40D07236	Free Clinics	Free Clinic Program	Enactment Cost §20 Retractment Cost §10 Monthly Cost §50 + §0.005 per §1 in Health Department Funding Health Quotient Increased by 10%
A0D07129	Gambling	Legalise Gambling	Enactment Cost §0 Retractment Cost §20 Monthly Income §100 Crime Increased By 20% Enables Casino
815B4CEF	Junior Sports	Junior Sports Programs	Enactment Cost §20 Retractment Cost §10 Monthly Cost §50 + §0.005 per §1 in Parks Funding Crime Decreased by 5%
22F6E80C	Landfill Gas Recovery	Landfill Gas Recovery Program	Enactment Cost §20 Retractment Cost §10 Monthly Cost §20 + §0.001 per person Air Pollution Decreased by 3% Requires Landfill Requires Gas Power Plant
62BF1DB9	Neighborhood Watch	Neighborhood Watch Program	Enactment Cost §20 Retractment Cost §10 Monthly Cost §50 + §0.005 per person Crime Decreased by 5% Requires Police Station
E0D0722E	Nuclear Free Zone	Nuclear Free Zone	Enactment Cost §10 Retractment Cost §10 Monthly Cost §50 + §0.002 per person Agricultral Demand Increased by 0.33% High-Tech Industry Demand Decreased by 17% Mayor Rating Increased by 5 Note: No new Nuclear Plants of any kind may be built after enactment and any existing plants will be decomissioned automatically.
22F6E81B	Paper Reduction	Paper Waste Reduction Program	Enactment Cost §20 Retractment Cost §10 Monthly Cost §20 + §0.005 per person §§ Commercial Demand Decreased by 0.33% §§§ Commercial Demand Decreased by 0.17% Garbage Output Decreased by 10%
82B9999B	Power Conservation	Power Conservation Act	Enactment Cost §20 Retractment Cost §10 Monthly Cost §0 + §0.005 per person Dirty Industry Demand Decreased by 0.50% Manufacturing Demand Decreased by 0.50% High-Tech Industry Demand Decreased by 0.50% Power Demand Decreased by 10%
E0D07233	Pro-reading Campaign	Pro-Reading Campaign	Enactment Cost §10 Retractment Cost §10 Monthly Cost §20 + §0.005 per §1 in Library Funding School Effect Increased by 10%
A2BF1DE5	Shuttle Service	Commuter Shuttle Service	Enactment Cost §20 Retractment Cost §10 Monthly Cost §20 + §0.005 per person Air Pollution Decreased by 2% R§ Travel Strategy 85/15/0 (Instead of 80/20/0) R§§ Travel Strategy 35/0/65 (Instead of 30/0/70) R§§§ Travel Strategy 15/75/10 (Instead of 10/80/10)
62BF1DAA	Smoke Detectors	Smoke Detector Program	Enactment Cost §10 Retractment Cost §10 Monthly Cost §0 + §0.001 per person Flammability Decreased by 5%
C2F6E81F	Tyre Recycling	Tyre Recycling Program	Enactment Cost §10 Retractment Cost §10 Monthly Cost §20 + §0.001 per person Garbage Output Decreased by 3%
62F6E7CF	Tourist Promotion	Tourist Promotion Program	Enactment Cost §10 Retractment Cost §10 Monthly Cost §50 + §0.005 per §1 in Landmark Funding § Commercial Demand Increased by 0.33% §§ Commercial Demand Increased by 0.33% §§§ Commercial Demand Increased by 0.33%
42BF1E18	Trash Presorting	Trash Presort Requirement	Enactment Cost §20 Retractment Cost §10 Monthly Cost §50 + §0.005 per §1 in Recycling Funding Garbage Output Decreased by 3% Requires Recycling Center
02BF1DFA	Water Conservation	Water Conservation Program	Enactment Cost §10 Retractment Cost §10 Monthly Cost §50 + §0.005 per person Agricultral Demand Decreased by 0.83% Dirty Industry Demand Decreased by 0.50% Manufacturing Demand Decreased by 0.33% High-Tech Industry Demand Decreased by 0.17% Water Use Decreased by 10%
42BF1E18	Youth Curfew	Youth Curfew Act	Enactment Cost §10 Retractment Cost §10 Monthly Cost §40 + §0.002 per person Mayor Rating Decreased by 10 Crime Decreased by 5%