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Regulatory Compliance

Our mission is to protect the City of Corona's water reclamation systems, water quality, our residents, our workers and the environment.

water swirl

Achieving these objectives will eliminate the discharge of pollutants into surface waters and increase the level of water quality for our future and for generations to come.

Our program includes the following components:

  • Ensure that the DWP maintains compliance with water, wastewater and air quality programs.
  • Implement the City of Corona's pre-treatment program.
  • Work with industries to assist them in achieving compliance with pre-treatment requirements.

To learn more about compliance, read about our Required Plans & Reports, Discharge Regulations, and see our Consumer Confidence Reports. The DWP must also comply with the 20% by 2020 water use reduction requirement.


Required Plans and Reports

SSMP Development Plan & Development Schedule (SSMP)

The City of Corona Department of Water & Power was required to develop a Sanitary Sewer Management Plan (SSMP) per the State Water Resources Control Board (SWRCB) Order No. 2006-0003, Statewide General Waste Discharge Requirements for Sanitary Sewer Systems (Order No. 06-03). The City of Corona's SSMP was adopted by Resolution No. 2009-018 of the Corona City Council on February 18, 2009.

Urban Water Management Plan (UWMP)

An Urban Water Management Plan (UWMP) is required by the California Water Code, and applies to all urban water suppliers that supply more than 3,000 acre-feet of water per year or serve more than 3,000 connections. The UWMP is a planning document that is used to:

  • report to the Department of Water Resources on existing local and planned water supplies;
  • compare forecasted supplies against demands during normal, dry and multiple-dry year conditions to ensure water supply reliability and sufficiency;
  • maintain the efficient use of urban water supplies;
  • promote conservation programs and policies; and
  • provide a mechanism for response during drought conditions.

UWMPs are required to be updated every five years for years ending in 0 or 5. The UWMP must satisfy all of the requirements in the Urban Water Management Planning Act. To measure water use reduction and targets, all UWMPs must define:

  • A baseline water use in gallons per capita per day, or GPCD, based on a 10-year time period.
  • A 2020 target based on one of four methodologies.
  • An interim target, to be reached by 2015, that is halfway between the baseline and 2020 target.

See the Corona UWMP
The City of Corona Department of Water and Power draft UWMP for 2015 is available for review and comments here:


Water Supply Reliability Certification

On May 9, 2016, Governor Brown issued a new Executive Order directing actions aimed at using water wisely, reducing water waste, and improving water use efficiency. The Executive Order, in part, directs the State Water Board to extend the emergency regulations for urban water conservation through the end of January 2017. As part of the executive order, urban water districts must complete an annual Water Supply Certification to use as the basis for future water conservation targets.

In compliance with the order, here is the water supply reliability certification for the City of Corona Department of Water and Power:


Discharge Regulations

The City of Corona's discharge program consists of a self-monitoring program. Any discharges that cannot be sent to the City's system may go to the Inland Empire Brine Line.

Self-Monitoring Program

All Class I, II and III industries permitted by the DWP will almost certainly be required to monitor their effluent for compliance with the City of Corona discharge regulations, a process known as self-monitoring. The self-monitoring program requires industries to collect samples of their industrial wastewater effluent, usually using an automatic sampler, and have the sample analyzed for the constituents listed in their industrial waste discharge permit. Most permittees contract this work out. Once the sample has been analyzed, the results are submitted to the DWP. The data is then reviewed by the DWP and entered into the City of Corona database.

The most common self-monitoring schedules involve monitoring the industrial wastewater effluent monthly or quarterly. In some cases, monitoring is done on a weekly basis.

The City of Corona requires self-monitoring for a number of reasons:

  • Significant Non-Compliance Determination (SNC): Self-monitoring data, in conjunction with DWP data, is used to determine compliance with discharge limits outlined in industrial waste discharge permits. A company will receive a SNC if they are more than 30 days late submitting their self-monitoring reports.
  • Flow Base Determination: The daily industrial flow reported on the self-monitoring report is used with other flow data to determine the mass emission rate flow base.
  • Enforcement: The self-monitoring data may be used in enforcement actions
  • Wastewater Use Charges: The BOD, TSS and total oil and grease and flow data may be used to determine wastewater surcharges.
  • Responsibility to the Environment: Self-monitoring helps maintain the company focus on responsibility and makes them aware of the potentially negative impact the industrial wastewater discharge may have on the City of Corona wastewater system.

Inland Empire Brine Line

For discharges that cannot be handled by the City's wastewater system, connection to the Inland Empire Brine Line (previously known as the Santa Ana Regional Interceptor or SARI) may be necessary. The IE Brine Line was built specifically to handle high-saline waste streams.

Lead and Copper Rule (LCR)

In 1991, the Environmental Protection Agency (EPA) published a regulation to control lead and copper in drinking water. This regulation is known as the Lead and Copper Rule (also referred to as the LCR). Since 1991 the LCR has undergone various revisions. The treatment technique for the rule requires systems to monitor drinking water at customer taps. If lead concentration exceeds an action level of 15 micrograms per liter (parts per billion, ppb) or copper concentration exceeds an action level of 1.3 milligrams per liter (parts per million, ppm)  in more than 10% of customer taps sampled, the system must undertake a number of additional actions to control corrosion. If the action level for lead is exceeded, the system must also inform the public about steps they should take to protect their health and may have to replace lead service lines under their control.

While the LCR applies to water utilities, the reduction of lead in Section 1417 of the Drinking Water Act sets standards for pipe, plumbing fittings, fixtures, solder, and flux. After June 1996, the act prohibits the use of any pipe, plumbing fitting, fixture, any solder, or any flux that is not lead free. It applies to the installation or repair of any public water system or any plumbing in a residential or non-residential facility providing water for human consumption.

The following are some actions you can take to reduce the chance of lead in drinking water:

  • Flush taps before using water for drinking or cooking. If the water in the faucet has been unused for six hours or more, “flush” the tap. This is done by allowing cold water to run for 15-30 seconds. To conserve water, collect the flushed water for non-consumption purposes such as watering the garden or potted plants.
  • Use only cold water for consumption: drinking, cooking, and especially for preparing baby formula. Hot water can dissolve more lead faster than cold water.  
  • After you have taken the precautions listed above, if you suspect a problem you can have your water tested. The only way to be sure of the amount of lead in your water is to have it tested by a competent laboratory. Your water supplier may be able to provide you information or assistance with testing. Testing is especially important for apartment dwellers because flushing may not be effective in high-rise buildings with lead-soldered central piping.

Questions and Answers

Why is lead a problem?
Although it has been used in numerous consumer products, lead is a toxic metal now known to be harmful to human health if inhaled or ingested. Important sources of lead exposure include: ambient air, soil and dust (both inside and outside the home), food (which can be contaminated by lead in the air or in food containers), and water (from the corrosion of plumbing). On average, it is estimated that lead in drinking water contributes between 10 and 20 percent of total lead exposure in young children. In the last few years, federal controls on lead in gasoline have significantly reduced people's exposure to lead. The degree of harm depends upon the level of exposure (from all sources). The effects to lead exposure range from subtle biochemical changes at low levels, to severe neurological and toxic effects or even death at extremely high levels.

Does lead affect everyone equally?
Young children, infants and fetuses appear to be particularly vulnerable to lead poisoning.  The same amount of lead that can have little effect on an adult can have a big effect on a child. A child's mental and physical development can be irreversibly stunted by over-exposure to lead. In infants, whose diet consists of liquids made with water, such as baby formula, lead in drinking water makes up an even greater proportion of total lead exposure (40 to 60 percent).

How could lead get into my drinking water?
Typically, lead gets into your water after the water leaves the treatment plant or the water well. The source of lead in your home's water is most likely pipe or solder in your home's own plumbing. The most common cause is corrosion which is a reaction between the water and the lead pipes or solder. Dissolved oxygen, low pH (acidity), and low mineral content in water are common causes of corrosion. One factor that increases corrosion is the practice of grounding electrical equipment (such as telephones) to water pipes. Any electric current traveling through the ground wire will accelerate the corrosion of lead in the pipes. (Nevertheless, wires should not be removed from pipes unless a qualified electrician installs an adequate alternative grounding system.)

Does my home's age make a difference?
Lead-contaminated drinking water is most often a problem in houses that are either very old or very new. Up through the early 1900's it was common practice in some areas of the country to use lead pipes for interior plumbing and service connections. Plumbing installed before 1930 is most likely to contain lead.

Copper pipes have replaced lead pipes in most residential plumbing. However, the use of lead solder with copper pipes is widespread. Experts regard this lead solder as the major cause of lead contamination of household water in U.S. homes today. New brass faucets and fittings can also leach lead, even though they are "lead-free."

Scientific data indicate that the newer the home, the greater the risk of lead contamination. Lead levels decrease as a building ages. This is because, as time passes, mineral deposits form a coating on the inside of the pipes (if the water is not corrosive). This coating insulates the water from the solder. But, during the first five years (before the coating forms) water is in direct contact with the lead. More likely than not, water in buildings less than five years old has high levels of lead contamination.

How can I find out if there is lead in my drinking water?
The consumer confidence report available at www.CoronaDWP.org indicates the concentration of lead detected during the latest sampling. Residents can have their water tested for lead if desired; especially if it is known that the house has lead pipes (lead is a dull gray metal that is soft enough to be easily scratched with a house key). Testing costs range between $20 and $100 depending on the laboratory. Since you cannot see, taste, or smell lead dissolved in water, testing is the only sure way of telling whether or not there are harmful quantities of lead in your drinking water. Your water supplier may have useful information, including whether or not the service connector used in your home or area is made of lead.

How do I have my water tested?
Water samples from the tap will have to be collected and sent to a qualified laboratory for analysis. Contact your local water utility or your local health department for information and assistance. In some instances, these authorities will test your tap water for you, or they can refer you to a qualified laboratory. You may find a qualified testing company under “Laboratories" in the yellow pages of your telephone directory. You should be sure that the lab you use is approved by your state or by EPA as being able to analyze drinking water samples for lead contamination. To find qualified laboratories, contact your state or local department of the environment or health.

What are the testing procedures?
Arrangements for sample collection will vary. A few laboratories will send a trained technician to take the samples; but in most cases, the lab will provide sample containers along with instructions as to how you should draw your own tap-water samples. If you collect the samples yourself, make sure you follow the lab's instructions exactly as they are written. Otherwise, the results might not be reliable. Make sure that the laboratory is following EPA's water sampling and analysis procedures. Be certain to take a "first draw" and a "fully flushed" sample. (The first-draw sample, taken after at least six hours of no water use from the tap tested, will have the highest level of lead, while the fully flushed sample will indicate the effectiveness of flushing the tap before using the water.)