The City of Manteca has updated a Storm Drain Master Plan (SDMP) to provide a
contentiety of storm drainage design criteria for the new and redevelopment projects. The SDMP identifies and analyzes the existing drainage deficiencies as of 2012 and provides the storm drainage concepts for the future developments required to serve the City at buildout of the General Plan 2023.
The SDMP is available to review here: Storm Drain Master Plan (2013)
Stormwater Pollution Prevention
The City of Manteca operates and maintains the Storm Drain System, which serves the community. The City's Storm Drainage System consists of approximately 170 miles of pipeline, 36 pump stations, and 35 detention basins. When it rains, the runoff flows through this system, into South San Joaquin Irrigation District drains and laterals, and eventually into the San Joaquin River.
The City of Manteca is required by the Environmental Protection Agency, as part of the National Pollutant Discharge Elimination System (NPDES), to have a Storm Water Management Program (SWMP). The purpose of the program is to limit to the maximum extent practicable the discharge of pollutants into the waters of the United States.
You can access the City of Manteca Storm Water Management Program by clicking on this link.
Download the Free Acrobat Reader:
For general stormwater information, please call 456-8400.
For the San Joaquin County Hazardous Waste Hotline, call
For flooding problems during business hours, call 456-8400.
ONLY RAIN DOWN THE DRAIN!
What you can do:
In Your Community
- Be flood-ready: rake, sweep, and remove debris from storm drain catch basin grates.
- Help keep the streets and gutters clean. Sweep your sidewalks and driveways and pick up the debris instead of hosing it down the storm drain.
- Reduce automobile use by carpooling, riding the bus, bicycling, or walking.
- Wash your car at commercial car washes that recycle their wash water.
- Support businesses in your community that offer or use least toxic alternatives and practice pollution prevention.
- Encourage others to reduce, reuse, and recycle whenever they can.
- Report any illegal discharge into the storm drains.
- Participate in local events.
In Your Home
- When using chemicals, detergents and pesticides, use only the amount recommended by the manufacturer and use them according to the directions.
- Purchase household and garden products that are "least toxic" to the environment.
- Avoid purchasing oil-based paint.
- Rinse out water-based (latex) paint brushes in the sink or dispose of them in the trash.
- Find the nearest recycling center to dispose of your hazardous waste.
- Shovel up animal waste, seal it in bags, and throw it into the garbage. Animal waste can also be flushed down the toilet.
In Your Garden
- Purchase household and garden products that are "least toxic" to the environment.
- Sweep sidewalks and patios rather than hosing debris into gutters.
- Avoid using pesticides or herbicides on your yard and garden.
- Garden organically or use alternatives to chemicals whenever possible.
- Do not over-water lawns and gardens. Over-watering can flush large quantities of pesticides and fertilizer directly into storm drains.
- Take care of your lawn in an environmentally friendly way. Download the EPA booklet Healthy Lawn, Healthy Environment (a large PDF file).
In Your Garage
- Have your car tuned up regularly to make sure it is operating as cleanly as possible with no leaks of oil or other fluids.
- Find a location near you to recycle motor oil, anti-freeze and other automotive fluids.
- Fix car leaks right away.
The Federal Emergency Management Agency (FEMA
) has released new preliminary flood insurance rate maps for our area.
Viewing the maps listed below requires Adobe Acrobat. A free reader is available here:
San Joaquin County Map Index
South Manteca Map
Southwest Manteca Map
North Manteca Map
Northeast Manteca Map
Download Flood Protection Flyer, December 2007:(PDF File)
Download Flood Protection Flyer, July 2008:(PDF File)
200 Year Composite Floodplain Overall Map, June 2014
200 Year Composite Floodplain Southwest manteca Map, June 2014
200 Year Composite Floodplain Map Exhibits Index, June 2014
200 Year Composite Floodplain Map Exhibit A Maps, June 2014
200 Year Composite Floodplain Map Exhibit B Maps, June 2014
200 Year Composite Floodplain Map Exhibit C Maps, June 2014
If you cannot view the maps on this site, a paper copy may be viewed during normal business hours at the Public Works Department, located at 1001 West Center Street, Manteca.
More information is available at the San Joaquin County web site
Storm Water Guidelines for Car Wash Fundraisers
Although car washing fundraisers are a popular means of raising money for worthwhile causes, there are important environmental issues that, if not properly managed, can negatively impact the aquatic environment and degrade local waterways. When conducting your fundraiser you should follow these guidelines in order to prevent the wash water from entering the storm drains, where it flows without treatment of any kind to our streams, rivers and eventually into the ocean.
How does runoff from car wash fundraisers harm the environment?
During a car wash fundraiser, the soapy water used to wash the cars combines with automotive fluids and residues from the engine, drive train and brakes. The polluted water flows across the pavement and into nearby storm drains. Alone, one car wash fundraiser event may not create a significant adverse environmental impact. But, collectively, car wash fundraiser events can contribute significant amounts of badly polluted wash water to the storm drain system.
Before beginning your car wash fundraiser
Hold a meeting with all participants to explain the proper procedures that should be followed when conducting these activities.
Remove all trash and debris from the car washing area
Use only soaps, cleaners or detergents labeled "non-toxic," "phosphate free," or "biodegradable." The safest products for the environment are vegetable-based or citrus-based soaps.
Do not use acid-based wheel cleaners or engine degreasers
Select a washing site where the wash water can soak into grass, gravel, or be diverted to nearby landscaping. This will allow the wash water to filter through the vegetation and/or soil instead of flowing directly into a storm drain.
If you select a site that drains into a street, block off the storm drain with sandbags and either divert the wash water to an area where the water can pool and evaporate throughout the day or arrange to dispose of the wash water down a sanitary sewer drain.
During the car wash fundraiser
Shake debris from car mats into a trash can or vacuum them. Do not shake dirt from car mats directly onto the ground.
Use a bucket of soapy water to clean and re-soap rags or sponges throughout the wash rather than adding more soap directly to rags or sponges.
Wring sponges and washrags into buckets, not onto the ground.
Conserve water by using a spray nozzle with an automatic shut-off and shutting off or kinking the hose when not in use.
Always empty buckets into the sanitary sewer system (e.g., mop sinks or toilets).
After the car wash fundraiser
Remember to clean up and remove sand bags, if used. Have a volunteer walk the perimeter of the site to pick up trash and debris and dispose of it properly.
Before you allow anything to go into the gutter or storm drain, stop and think. Storm drains do not go to the public sewer system; they flow directly into storm drains, channels and streams to the ocean.
Remember that you are a valued participant in our City's Pollution Solution.
General Resources for Storm Water Protection
The City's Storm Water Protection Program is part of a statewide effort to protect our creeks, rivers, ocean and other natural water bodies from pollution. The program is regulated by the California Regional Water Quality Control Board.
For stormwater general information, please contact the Public Works Department.
City of Manteca Public Works, 1001 W. Center Street, Manteca, CA 95337 (209) 456-8400
For the San Joaquin County Hazardous Waste Hotline, please call (800) 449-4840.
Visit these sites for more information on Alternative Pest Management:
- Pest Notes from the UC Davis Integrated Pest Management (IPM) Project provides in-depth information on insect pests and alternative control measures.
- The Bio-Integral Resource Center (BIRC) in Berkeley provides consultation, literature, and periodicals on non-toxic pest control to individuals, businesses, and public agencies.
Invite "Good Bugs" to Your Garden
Spring and summer bring warm sunshine, fields of flowers, vines bursting with tomatoes and, of course, those destructive little pests and bugs! But did you know some are actually "Good Guys" in the garden? For example, antlions really do feast on ants, and lacewings have a voracious appetite for aphids. Studies have shown that the use of chemical pesticides can actually cause outbreaks of pests by eliminating these natural predators.
Consider alternative pest management practices such as biological controls. Many nurseries sell beneficial insects like ladybugs. Ladybugs, both adults and larvae, are known primarily as predators of aphids. But they also prey on many other pests such as soft-scale insects, mealybugs and spider mites; and they devour the eggs of beetles and borers.
One of the best ways to promote biological control of pests is to encourage beneficial insects by choosing plants that provide them with pollen, nectar and shelter. Fennel, coriander and dill provide the tiny flowers savored by parasitoid wasps. These tiny wasps are aggressive beyond their size when it comes to pursuing aphids and caterpillars.
And rather than pulling out all of your "wild weeds" such as dandelions, goldenrod and mustard, leave a few in the back yard. They're all good sources of food for many predatory insects.
Stewards of Our Waterways
By saying "NO" to chemicals, you're also protecting our creeks and streams. Unintentional rinsing of chemical pesticides into storm drains pollutes our creeks and streams because storm drains are direct paths to our waterways.
If your pest problem cannot be controlled biologically, consider using less-toxic pesticides like insecticidal soaps, dusts and horticultural oils. Apply pesticides sparingly, follow label instructions, and apply only to problem areas. Some don'ts to remember:
- Don't let water run off your yard immediately after applying pesticides.
- Don't apply pesticides if rain is in the forecast.
One teaspoon of diazinon makes 2.5 million gallons of water toxic to aquatic organisms like water fleas. Diazinon is one of the most widely used pesticides - 50,000 pounds of diazinon are used every year in the urban areas of Sacramento County. Water sampling reveals that toxic levels of diazinon are almost always present in our creeks and streams.
In December, 2000, the Environmental Protection Agency (EPA) announced an agreement to phase out diazinon. The phase-out of products for indoor use began in March 2001 with registration cancellation; retail sales stopped by December 2002. Manufacturing of diazinon for lawn and garden uses stopped in June 2003, with sales and distribution by retailers ceasing in August 2003.
Proper Pesticide Disposal
Proper disposal of pesticides such as diazinon is just as important as proper use. Never dispose of chemical pesticides or any other toxic waste by dumping it down storm drains or sinks. Take your unused toxic chemicals to the San Joaquin County Household Hazardous Waste Facility for disposal. Free events are scheduled on a regular basis; call 1-800-449-4840 to find out the next time and location. City of Manteca Household Hazardous Waste web page here.
Stormwater discharges associated with construction activity are a potential source of pollutants. The most common pollutant associated with construction activity is sediment. Sediment and other construction-related wastes could degrade water quality in creeks, rivers, lakes, and other water bodies. All construction sites disturbing one or more acres of land are required to obtain permit coverage.
Storm Water Permit Requirement FAQs
How do I know if I need this permit?
- Construction activity resulting in a land disturbance of one acre or more, or less than one acre but part of a larger common plan of development or sale must obtain a Construction Activities Storm Water General Permit (General Permit). Construction activity includes clearing, grading, excavation, stockpiling, and reconstruction of existing facilities involving removal and replacement of soil. Construction activity does not include routine maintenance, such as maintenance of original line and grade, hydraulic capacity, or original purpose of the facility.
Who should apply, and who is the proper signatory?
- The General Permit currently states the owner of the land where the construction activity is occurring is responsible for obtaining a permit and for signing the certification statement on the Notice of Intent (NOI). Language in Section C 9: "Signatory Requirements" allows a duly authorized representative to sign documents including the NOI.
What are the fees associated with the Permit?
- The fee is calculated by the acre. Contact the state for a current fee schedule.
You will continue to receive an annual invoice until your project is complete and a Notice of Termination is submitted and approved by the Regional Water Quality Control Board.
Where do I send the NOI application?
- Mail a complete NOI package including: the original signed NOI, site map, and appropriate fee to the State Water Resources Control Board at the following address:
- Regular Mail:
- State Water Resources Control Board
Division of Water Quality
Attn: Storm Water Section
PO Box 1977
Sacramento, CA 95812-1977
- FedEx or other overnight mail
- State Water Resources Control Board
Division of Water Quality
Attn: Storm Water Section
1001 I Street
Sacramento, CA 95814
Whom should I contact if I have questions?
If you have any questions concerning the General Permit please email the State Water Resources Control Board at firstname.lastname@example.org or call (916) 341-5537.
California Regional Water Quality Control Board Central Valley Region
Information is also available at the SWRCB web site: http://www.swrcb.ca.gov/stormwtr/construction.html
Construction Best Management Practice Manual - This BMP manual, created by the California Stormwater Quality Association (CASQA), has a Microsoft Word Document Template that you can download to create your Storm Water Pollution Prevention Plan.
New Development and Redevelopment Best Management Practice Manual - This BMP manual was also created by CASQA. It is an excellent tool for project planning and design.
- Motor Oil Recycling - Manteca provides its residents with oil collection containers that are picked up on a weekly basis and exchanged for another container.
- Manteca Solid Waste Recycling Division - Information about residential collection services.
- International Erosion Control Association - A non-profit, member organization that provides education, resource information and business opportunities for professionals in the erosion and sediment control industry.
- Erosion Control - Links to other erosion control information for Business and Industry.
Best Management Practices (BMPs):
BMPs include treatment facilities such as vegetated strips and detention basins, as well as policies and procedures that include the proper handling, storage, and disposal of toxic materials to prevent stormwater pollution.
Curbside opening that collects rainwater from streets and serves as an entry point to the storm drain system.
The first big rain after an extended dry period (usually summer), which flushes out the accumulated pollutants in the storm drain system and carries them straight to the creeks and rivers.
Flood control channel:
The open portion of the storm drain system
The edge of a street (below the curb) designed to drain stormwater runoff from streets, driveways, parking lots, etc., into storm drain inlets.
Household hazardous waste:
Common everyday products that people use in and around their homes (including paint, paint thinner, herbicides, and pesticides) that, due to their chemical nature, can be hazardous if not properly disposed of.
The release or placement of any material into the City of Manteca stormwater conveyance system which is not authorized by the City.
Any connection to the storm drain system that is not permitted, or any legitimate connection that is used for illegal discharge.
Non-point source pollution:
Pollution that does not come from a single, identifiable source. Includes materials that wash from roofs, streets, yards, driveways, sidewalks and other land areas - this is the largest contributor of stormwater pollution.
A flow of water from one drainage system into a larger system, or into a body of water like a creek, river or lake.
Point source pollution:
Pollution from a single identifiable source, such as a factory or construction site. Most of this pollution is highly regulated at the state and local levels.
Action to prevent pollution where it originates.
Storm drain system:
A network of underground pipes and open channels designed for flood control, which discharges straight to creeks and rivers.
Rainwater that enters the storm drain system and empties into rivers, lakes and streams.
Water from rain, irrigation, garden hoses, or other activities that picks up pollutants (cigarette butts, trash, automotive fluids, used oil, paint, fertilizers and pesticides, lawn and garden clippings and pet waste) from streets, parking lots, driveways and yards and carries them through the storm drain system and straight to local creeks and rivers.
An area of land that drains water or runoff to a single point.
Frequently Asked Questions
What is stormwater pollution?
Runoff from rainstorms is called stormwater. Stormwater becomes polluted by flowing over dirty surfaces, such as parking lots. Stormwater pollution also takes place when someone illegally dumps materials, like oil or paint, directly into the storm drain. Polluted stormwater flows without treatment directly to creeks and rivers, where it can be harmful to aquatic life.
What are catch basins or storm drain inlets?
Catch basins and storm drain inlets are curbside receptacles whose sole function is to catch surface water runoff from rainfall and deliver it to the storm drain system, where it's eventually delivered to local creeks and rivers.
Are sewers and storm drains the same thing?
No. Storm drains and sanitary sewers have two distinct functions. Storm drains are intended to collect and transport runoff from rainfall. Storm drain systems do not remove pollutants from water before it is discharged into streams and rivers. Storm drain inlets are typically found in streets at the curb and in parking lots. Sanitary sewers collect wastewater from indoor plumbing such as toilets, sinks, washing machines and floor drains and take it to a sewage treatment plant. The treatment plant removes many pollutants from wastewater before it is discharged to the river.
Do drain inlets get cleaned out?
Yes. City crews maintain approximately 170 miles of storm drain pipelines citywide.
Why doesn't the City clean out all of the storm drain inlets right before a storm?
There are too many for City crews to clean in a short period of time. Storm drain inlets are maintained on a year-round schedule.
Why doesn't the City install filters or screens in front of drain inlets?
It sounds like a good idea, but during a rainstorm, trash is quickly swept into drain inlets. Any screen or filtration device placed in front of the drain inlet would cause trash to accumulate and clog the grate, preventing proper drainage and potentially creating a flood hazard. City maintenance crews would be unable to keep up with cleaning these devices, potentially creating flooding hazards. However, there are new technologies being developed in the form of filtration or screening devices to be installed and inserted inside catch basins. The Stormwater Program Engineering groups are always evaluating these new technologies for possible future use.
What types of pollutants are found in the storm drain system?
Heavy metals, paint thinner and paint products, motor oil, pesticides, fertilizers, human and animal feces, antifreeze, and dead animals are just a few examples of the pollutants typically found in the storm drain system.
What is the City of Manteca doing about illegal dumping?
The City's Stormwater Ordinance makes it an environmental crime to knowingly dump or discharge hazardous materials into the storm drain system and the City can impose fines on violators when they are caught.
I see people dumping their used oil into storm drains all the time. What can I do?
Dumping used oil into the storm drain system is illegal. One gallon of motor oil can pollute 250,000 gallons of drinking water. To report the problem, call 456-8400. All City residents can recycle their used, uncontaminated motor oil free of charge. Contact the Solid Waste division at 456-8440.
What should I do if I see a neighbor, or know someone who's throwing trash into a storm drain?
Storm drains are designed for catching rain water only. Dumping trash or other pollutants down storm drain inlets is illegal and is a violation of the Federal Clean Water Act of 1972 as well as the City of Manteca's Stormwater Ordinance. If a neighbor is disposing of trash in the storm drain, they may not understand that drain inlets directly connect to our creeks and rivers. If you have an amicable relationship with your neighbor, it may be just a matter of informing and making them aware of its environmental impact. If it is someone who you feel is knowingly violating and repeatedly dumping into storm drains, please call the City of Manteca at 456-8400.
I have some paint/thinners/chemicals/batteries at home that need to be disposed of. Where can I take these?
Paints, paint thinner, chemicals and batteries are all household hazardous waste that need proper disposal. If you are a resident or business owner living within San Joaquin County, you can take your household hazardous waste materials to a Household Hazardous Waste event, or to the Lovelace Transfer Station at 2323 E. Lovelace Rd. Call (800) 449-4840 for drop off times, locations, or for more information.
What is the fine/penalty for illegal dumping?
Fines and penalties are based on the type and amount of illegally discharged material. Each violation can be based on, but not limited to, a cost recovery fine and/or enforcement fine.
How can I be environmentally responsible when washing my car?
The best place to wash your car is over a lawn or gravel area. Use biodegradable soaps to wash your vehicle, using as little water as possible. Shut off water while washing your car, or use a trigger nozzle to stop the flow. Remember not to leave your car on the lawn. We would highly recommend going to a full- or self-service car wash, since these facilities use recycled water.
Yard clippings and leaves are natural, so they don't cause any problems, right?
Grass, leaves and yard clippings that are repeatedly swept into catch basins can clog the drain, causing flooding and the potential for becoming a breeding ground for rodents and insects. Additionally, when grass and leaves decompose they encourage excessive growth of algae, which can deprive fish of adequate oxygen.
City of Manteca
Stormwater Management Online Survey
Please click the picture to participate the Online Survey!
2010 Manteca Stormwater Survey Result
Can you pass this Test?
This picture shows 8 instances of common household practices that can cause serious pollution.
Department of Horticulture, Cornell University, hort.cals.cornell.edu
Can you spot them? (Click HERE to view larger image).
Click here for Answers
The stormwater program is supported by the
South San Joaquin Irrigation District (SSJID).