The City of Aliso Viejo has established guidelines for backflow prevention and cross-connection control to protect the public water supply.
Aliso Viejo property owners are responsible for ensuring that backflow prevention devices are properly installed, tested annually, and maintained in good working order. Non-compliance with these regulations can lead to penalties, civil liabilities and the interruption of water service.
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Because backflow devices are critical to maintaining clean, safe water supplies, California State Water Districts, County Health Boards and Local Municipalities regulations mandate that only licensed and certified backflow technicians and plumbers who have the expertise, training, have the legal authority to perform repairs or replacements in compliance with regulations and with the necessary quality control to protect the public water system.
Failing to comply with the regulations may result in fines or suspension of water service. It is important for Aliso Viejo homeowners and businesses to stay up-to-date with local regulations and to ensure that their backflow devices are tested annually by a certified tester.
The City of Aliso Viejo has adopted rigorous standards for cross-connection and backflow prevention to protect its potable water system.
Through enforcement of its municipal code and collaboration with the Moulton Niguel Water District and the Orange County Health Care Agency, the city ensures public health and water safety.
Property owners are obligated to install, test, and maintain backflow devices and cooperate with inspections. Non-compliance can lead to penalties, including the interruption of water service.
Backflow prevention devices must be installed following Plumbing and Building Code as well as California's State Building Standards.
Aliso Viejo property owners must also hire a certified backflow tester to perform annual tests on their devices. All backflow prevention devices must be tested annually by a certified backflow prevention tester to ensure that they are working correctly. Only individuals with a valid Certified Backflow Prevention Device Tester (C.B.P.D.T.) certification can conduct these tests.
Aslo, backflow test results must be submitted to the Moulton Niguel Water District and the Orange County Health Care Agency.
If the test results are not submitted on time, a penalty fee may be charged, and water service may be temporarily suspended.
Backflow device maintenance is also an important element of Aliso Viejo property owner's responsibilities. Homeowners and businesses are required to keep backflow prevention devices in good working order. If a backflow device fails the test, it must be repaired or replaced immediately.
Once repairs are made, the device must be retested and the new results submitted to the Moulton Niguel Water District or the Orange County Health Care Agency.
Backflow prevention devices that are beyond repair or obsolete may need to be completely replaced.
Failing to comply with the City of Aliso Viejo backflow regulations may result in fines or suspension of water service. It is important for property owners to stay up-to-date with local regulations and to ensure that their backflow devices are tested annually by a certified tester.
The City of Aliso Viejo enforces backflow prevention regulations to protect its public water supply from contamination. These regulations aim to prevent backflow, the unwanted reverse flow of water that can introduce pollutants or contaminants into the potable water system by implementing:
- Backflow Prevention: To prevent the reverse flow of water that could introduce pollutants or contaminants into the public water system.
- Cross-Connection Control: To eliminate or safeguard against connections between potable and non-potable water systems, ensuring the safety of drinking water.
MNWD requires the installation of specific backflow prevention devices based on the level of hazard associated with the water use. The determination of the appropriate device is made after an inspection by a Cross-Connection Control Specialist.
Aliso Viejo's water system is managed by the Moulton Niguel Water District and the Orange County Health Care Agency, which enforces backflow prevention measures in accordance with:
- California Plumbing Code (Title 24, Part 5 of the California Code of Regulations): Dictates backflow device installation, hazard classification, and device specifications.
- Title 17, California Code of Regulations: Defines cross-connection control program responsibilities for public water systems.
- USC Foundation for Cross-Connection Control: The City relies on USC’s list of approved backflow prevention assemblies and testing protocols. 
- AWWA Manual M14: Referenced for installation practices, hazard assessments, and maintenance recommendations.
Aliso Viejo regulations require the installation of approved backflow prevention assemblies (BPAs) to protect the water supply. Backflow prevention assemblies are required in various scenarios, including:
- Aliso Viejo Property Irrigation Systems: To prevent contaminants from entering the potable water supply through irrigation lines.
- Aliso Viejo Commercial and Industrial Properties: Facilities with potential cross-connections, such as those involving chemicals or pressurized systems, are required to install appropriate backflow prevention assemblies.
- Aliso Viejo Property Fire Protection Systems: To prevent stagnant water from fire suppression systems from flowing back into the drinking water supply.
- Aliso Viejo Property Auxiliary Water Sources: Properties with alternative water sources like wells or cisterns must install backflow prevention devices to prevent cross-contamination.
Property owners are responsible for installing backflow prevention assemblies as required by the city's regulations or or OCHCA. Installations must adhere to the city's standards, including specific device types and installation procedures.
Failure to install the required backflow prevention assemblies in compliance with Aliso Viejo regulations and requirements may result in the discontinuation of water service until compliance is achieved.
To ensure the continued effectiveness of backflow prevention assemblies, the following backflow testing and maintenance protocols are required in Aliso Viejo:
- Annual Backflow Testing: Backflow prevention assemblies must be tested at least annually to ensure proper operation.
- Post-Installation or Repair Backflow Testing: Any new installation, relocation, or repair of a backflow device requires immediate testing to confirm correct operation.
- Backflow Test Record Keeping: Test results must be submitted to the appropriate regulatory agency to maintain compliance records.
- Aliso Viejo Certified Backflow Testers: Tests must be conducted by individuals certified by recognized organizations, such as the American Water Works Association (AWWA) California-Nevada Section or the Orange County Health Care Agency.
- Approved Backflow Devices: Only backflow prevention assemblies listed by recognized testing agencies are permitted. The USC-FCCCHR provides a comprehensive list of approved devices.
Failure to conduct required backflow testing for Aliso Viejo properties may lead to water service termination until the device is tested and found compliant.
The City of Aliso Viejo requires the installation of specific backflow prevention devices based on the level of hazard associated with the water use:
- Reduced Pressure Principle Backflow Prevention Device (RP): Required for all non-residential connections to protect against high hazards.
- Double Check Valve Assembly (DC): Required for all non-residential fire suppression system connections, upgrades, and new installations.
- Air Gap Separation (AG): May be approved as a higher level of protection upon prior written approval from the City.These devices must be approved by the City and installed in accordance with the California Administrative Code Title 17, Section 7603.
These backflow devices must be installed immediately downstream of the water meter and must be approved by recognized testing agencies. The University of Southern California’s Foundation for Cross-Connection Control and Hydraulic Research (USC-FCCCHR) provides a comprehensive list of approved devices.
The appropriate device is determined based on the degree of hazard present at the property.
Proper testing and maintenance of backflow devices are essential for compliance with local regulations and for safeguarding community health.
The City of Aliso Viejo has the following requirements for testing, certification, and documentation of backflow prevention assemblies:
- Annual Backflow Testing: Backflow prevention assemblies must be tested at least annually to ensure proper operation.
- Certified Backflow Testers: Tests must be conducted by individuals certified by recognized organizations, such as the American Water Works Association (AWWA) California-Nevada Section or the Orange County Health Care Agency.
- Backflow Documentation: Test results should be submitted to the appropriate city department or agency overseeing water quality.
- Failure to Test: Failure to conduct required testing may lead to water service termination until the device is tested and found compliant.
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Aliso Viejo property owners are responsible for ensuring that backflow prevention devices are properly installed, tested annually, and maintained in good working order. Non-compliance with the following regulations can lead to penalties, including the interruption of water service:
- Install City-approved backflow devices when directed by the City.
- Arrange for annual backflow testing and maintain detailed records of compliance.
- Promptly address device failures or test result deficiencies.
- Allow site access for inspections and water system evaluations.
- Understand that non-compliance may result in disconnection of water services or fines.
The City of Aliso Viejo conducts thorough cross-connection inspections to monitor potential risks in both residential and commercial settings. These inspections are essential for maintaining water safety and preventing the backflow of contaminants into the public supply.
Below are the backflow inspection and installation guidelines for the City of Aliso Viejo:
Purpose of Inspections:
- Identify existing or potential cross-connections.
- Confirm that proper backflow prevention assemblies are installed.
- Evaluate whether device types match the hazard level.
- Enforce compliance where violations exist.
When Inspections Occur:
- During new construction, remodeling, or plumbing system upgrades.
- When a new service connection is initiated for commercial or industrial properties.
- Periodically, based on a property's risk profile or device testing history.
- In response to complaints or observed irregularities in water system behavior.
Inspection Process:
1. Advance Notice: Property owners are informed by the City before the inspection.
2. Onsite Visit: A certified Cross-Connection Specialist inspects the plumbing and device setup.
3. Hazard Assessment: The inspector evaluates system complexity and potential contamination risks.
4. Reporting: A written inspection report is issued with required actions or corrections.
5. Follow-Up: Re-inspections are scheduled for any deficiencies or outstanding issues.
Consequences for Non-Compliance:
- Water service may be suspended or disconnected.
- Re-inspection or administrative fees may be applied.
- Continued violations may result in legal penalties per the city code.
The City of Aliso Viejo implements strict Cross-Connection Control and Backflow Prevention regulations and ordinances require that all backflow prevention devices must be tested annually to ensure they are functioning properly. Tests must be conducted by a certified backflow prevention tester.
- Testing Fees: Determined by the private certified tester. These fees are separate from any City administrative or permit charges.
- Re-inspection or Reconnection Fees: May apply if devices fail, are overdue for testing, or service is disconnected due to non-compliance.
The City of Aliso Viejo's cross-connection and backflow regulations are built upon a combination of local municipal code, state plumbing regulations, and county public health enforcement. These include:
- California Plumbing Code (Title 24, Part 5 of the California Code of Regulations): Dictates backflow device installation, hazard classification, and device specifications.
- Title 17, California Code of Regulations: Defines cross-connection control program responsibilities for public water systems.
- USC Foundation for Cross-Connection Control: The City relies on USC’s list of approved backflow prevention assemblies and testing protocols.
- AWWA Manual M14: Referenced for installation practices, hazard assessments, and maintenance recommendations.
For more information or assistance, Aliso Viejo property owners can contact:
Moulton Niguel Water District
- Phone: (949) 831-2500
- Website: Aliso Viejo - Annual Backflow Testing
For further guidance or assistance with backflow prevention compliance, contact the Moulton Niguel Water District and the Orange County Health Care Agency.
Here is an outline of special circumstances pertaining to backflow assembly installation, testing and repair which require special attention:
- Emergency Backflow Events: In the event of a suspected backflow or contamination issue, property owners should immediately contact the Moulton Niguel Water District for assistance.
- Irrigation Systems: Properties with irrigation systems are required to have backflow prevention devices to prevent contamination from fertilizers or pesticides.
- Multi-Family and Commercial Properties: These properties may have more complex water systems and could be subject to more frequent inspections and advanced backflow prevention requirements.
Aliso Viejo, located in the southern region of Orange County, is a modern, master-planned city recognized for its clean design, well-integrated residential and commercial zones, and emphasis on education, technology, and wellness. With a population of approximately 52,000, Aliso Viejo represents the ideal of balanced urban-suburban living—combining scenic hillsides, a vibrant town center, and top-tier amenities within a compact, walkable footprint.
Incorporated in 2001, Aliso Viejo was the 34th city to join Orange County and one of the few to be fully master-planned from inception. Originally part of the historic Moulton Ranch, the area was developed in the 1980s and 1990s with a vision of creating a “live, work, and play” environment—where residential neighborhoods, business parks, schools, and open space coexist in harmony. This strategic approach has made Aliso Viejo one of Southern California’s most desirable and efficiently managed communities.
The city’s central gathering place is Aliso Viejo Town Center, a mixed-use district offering shopping, dining, entertainment, and civic amenities. Anchored by retail establishments, restaurants, and a movie theater, the Town Center is also home to City Hall, Aliso Viejo Library, and various community services. Regular events such as Summer Concerts, Holiday Tree Lightings, and family festivals reinforce the city’s vibrant community culture.
Aliso Viejo is highly regarded for its residential neighborhoods, which offer a mix of single-family homes, townhomes, condominiums, and gated communities. Areas such as Glenwood, Westridge, Talavera, and Laguna Audubon feature landscaped streets, access to parks and schools, and scenic views of the surrounding San Joaquin Hills. Many neighborhoods are linked by greenbelts and trails, enhancing walkability and outdoor connectivity.
The city places a strong emphasis on education. Aliso Viejo is served by the Capistrano Unified School District (CUSD), with highly rated schools such as Aliso Niguel High School, Don Juan Avila Middle School, and Oak Grove Elementary School known for academic excellence and enrichment programs. The city is also home to Soka University of America, a globally focused liberal arts college that attracts international students and hosts public lectures, cultural events, and artistic performances on its hilltop campus.
Recreation and open space are integral to the Aliso Viejo lifestyle. The city manages over a dozen parks and recreational facilities, including Aliso Viejo Community Park, Grand Park, and the Aliso Viejo Aquatic Center, which features a resort-style pool, splash pad, and lap swimming. The adjacent Aliso and Wood Canyons Wilderness Park, with over 4,500 acres of preserved open space, offers extensive trails for hiking, biking, and nature observation, connecting the city with the larger South OC wilderness network.
Economically, Aliso Viejo is a growing business hub, especially in the tech, software, financial services, and healthcare sectors. The Aliso Viejo Business Park and surrounding corporate centers house major employers such as Microsoft, Quest Software, UST Global, Cox Communications, and Ambry Genetics. The city’s highly educated workforce, proximity to Irvine and the I-5 corridor, and emphasis on quality infrastructure continue to attract innovative firms and entrepreneurs.
Public safety and services are provided through contracts with the Orange County Sheriff’s Department and the Orange County Fire Authority. The city maintains high standards for service delivery, urban design, and environmental sustainability. Planning initiatives emphasize traffic calming, energy efficiency, and community-oriented development.
Transportation access includes easy routes to State Route 73, Interstate 5, and nearby regional rail and bus systems. While primarily residential, Aliso Viejo’s connectivity to surrounding cities like Laguna Beach, Irvine, and Mission Viejo enhances its attractiveness for commuters and professionals.
Culturally, Aliso Viejo nurtures a forward-thinking, inclusive community spirit. Local organizations, neighborhood groups, and city-sponsored events contribute to a strong civic identity. The presence of Soka University, combined with the city’s diverse population, fosters a global outlook grounded in local engagement.
Municipal Office Contact Info:
Aliso Viejo City Hall
Address: 12 Journey, Suite 100
Aliso Viejo, CA 92656
Phone: (949) 425-2500
