SEWER COLLECTION SYSTEM
ANNUAL REPORT
A report of the history, current assessment, budget, activities, and the achievements of the Lancaster, California Sewer Collection System in Calendar Year 2024.
2024
City of Lancaster
Sewer Collection System Annual Report
Sewer Collection System Annual Report
L A N C A S T E R, C A L I F O R N I A 2024
System Overview
A Sanitary Sewer Collection System is a series of pipes, manholes, and lift stations that convey wastewater from homes and businesses to a treatment plant. The City of Lancaster’s (City) sanitary sewer collection system consists of a network of 439.70 miles of sewer lines, 9,300 sewer manholes, and one sewer lift station. This information is obtained from data input into the City’s Geographic Information System. The oldest sewer pipes in the City were installed in 1947 with a resultant average age of 40 years old. The estimated value of the sewer collection system is in excess of 300 million dollars.
City of Lancaster Sanitary Sewer System Collection History The City assumed responsibility for the operation and maintenance of its sanitary sewer system from the County of Los Angeles Consolidated Sewer Maintenance District on July 1, 2008. At that time the City formed Utility Services, a Section of the Public Works Division with the primary goal of properly managing, operating, and planning for the system to ensure it is a valuable asset for many years to come. With the goal of reducing the number of sewer overflows and to develop a program for the sustainability of the system, the City worked with the State and County Sanitation District to develop a maintenance program which would systematically clean and inspect the sewer pipes, visually and with cameras. Additionally, a program was developed to reduce the amount of harmful materials being discharged into the system. With these efforts, the number of overflows has been greatly reduced and staff believes there is a reliable plan in place to prolong the life of and manage the orderly growth of the sewer system.
Sanitary Sewer Overflow
A collection system’s greatest concern is a sanitary sewer overflow (SSO); this is when a pipe becomes clogged and raw sewage wastewater flows up and out of a manhole. SSOs are typically caused by roots growing into the pipes or a buildup of grease. Before the City maintained the system, the City suffered 20 or more SSOs every year. Currently, the City had two during this reporting period.
Maintenance Program
Cleaning
Cleaning consists of pipe flushing and root removal. Field staff cleans system pipes regularly using a hydrojet, a high-pressure jetting system which utilizes water and an optional vacuum to remove debris. This removes grease buildup as well as minor roots and debris to enable the wastewater to flow freely through the pipes. Blocked wastewater causes odors, SSOs, and damage to pipes. The objective of sewer pipe cleaning is to prevent future blockages of the sewer system. Roots are also removed by a mechanical cutting rodder or treated with environmentally safe foam. The majority of the maintenance budget is spent on these procedures.
DID YOU KNOW?
SANITARY SEWER MANHOLES IN THE CITY OF
LANCASTER VARY IN DEPTH FROM 8 FEET TO UP TO 23
FEET. THAT’S OVER TWO STORIES DEEP!
Sewer Collection System Annual Report
Inspections
Waiting for damage or blockages to present themselves is an expensive maintenance strategy. Therefore, staff follows a strict inspection schedule to identify problems before they result in SSOs or expensive repairs. The City owns a closed circuit television (CCTV) truck from which an operator sends a camera on a small -wheeled vehicle through the sewer lines. It is controlled remotely from the truck and the video is stored for further analysis. Blockages, roots, cracks, and damaged pipes are located and cleaning or repair is scheduled. CCTV provides staff an additional resource which enhances the planning of maintenance and repair programs.
When a system pipe is blocked, wastewater will slowly rise and fill a manhole. Locations have been identified where blockages are common and field staff visually inspect these manholes on a regular basis to proactively monitor for impending overflows.
Additionally, surcharge monitors have been installed in selected manholes; these monitors contain sensors on the underside of the manhole cover to measure water levels and will issue alerts of elevated flow levels so that corrective action can be taken before an overflow occurs. This prevents costly and messy sewer overflows.
Surcharge monitors are currently installed at ten locations throughout the City which had previously experienced sewer overflows.
Vermin Abatement
The City maintains a vermin abatement program within sewer manholes. The product used to treat manholes for roaches is called Zone Defense (boric acid). Boric acid, or Boron, is used in many household products and is safe for humans, unless ingested in large quantities. The product is applied by trained professionals using compressed air with a high-pressure hose to spread the product inside of the manhole. The product is pulled from the container and blown through the vent hole in the manhole lid to produce a dusting of powder throughout the manhole. A six- month follow -up inspection of the manhole is performed to evaluate the treatment. If necessary, the manhole is re-treated to eliminate vermin.
Prevention Program
Fats, Oils, and Grease (FOG)
Keeping harmful substances from entering the sewer is much easier than trying to get them out. Fats, Oils, and Grease are harmful to sewers and feed the bacteria that create hydrogen sulfide gas. Hydrogen sulfide causes a “rotten egg” smell, is a health risk, and deteriorates sewer pipes. FOG build up in pipes creates blockages and leads to blockages and SSOs.
WOULD YOU BELIEVE?
SOME CITY SANITARY SEWER LINES ARE UP TO 30
INCHES IN DIAMETER; ENOUGH TO ACCOMMODATE 52
MILLION TOILET FLUSHES PER DAY!
Sewer Collection System Annual Report
Food service establishments (restaurants, cafeterias, etc.) produce a significant amount of FOG. Lancaster is one of many cities that work with restaurants to reduce the amount of FOG sent down the drain. All food service establishments are required to apply for a FATS, OILS, AND GREASE (FOG) WASTEWATER DISCHARGE PERMIT prior to commencing operation and to submit to no less than an annual inspection by a FOG inspector. Under the regulations of the FOG discharge permit, a business must maintain best management practices to prevent FOG discharge, including scraping and dry wiping of pans and dishes into the trash before being washed, and maintain a grease removal device, such as a grease interceptor or trap. Staff regularly engages with the community to educate residents and business owners on how to best reduce their FOG impact on the sewer system.
Capital Improvements
A capital improvement program is employed to plan for affordable improvements instead of expensive emergency repairs. With an investment as large as the City’s sewer system, financial reserves and good planning are crucial.
As sewer pipes age or are exposed to chemicals, they can wear, crack, or collapse resulting in wastewater flowing out, and ground water seeping into the pipe. Once the sites in need of repair or replacement have been identified, staff develops a plan to fix them in the most cost-effective manner. New methods such as cured in place lining using trenchless technology to rehabilitate pipes, are proving to be an economical alternative to digging up streets and installing new pipe. The City is utilizing these and other cutting- edge techniques to stretch the capital budget. Trucks, equipment, and pumps require regular overhauls or replacement in order to remain efficient and effective; staff has developed, and is constantly enhancing, the long- term capital improvement program to ensure that major expenses are identified early and financial reserves are established.
Staffing
The Utility Services Division currently consists of a staff of 23, including the Assistant Director, Supervisor, Analyst, Senior Engineering Technician, Specialist I, Lead Maintenance Workers (2), Maintenance Worker II's (4), Maintenance Worker I's (9), Administrative Assistant, and Office Assistants (2).
Sewer Collection System Annual Report
Training
Staff holds memberships in the following organizations - • National Association of Sewer Service Companies, Inc. (NASSCO), • Water Environment Federation (WEF),
• American Water Works Association (AWWA),
• California Water & Environment Association (CWEA),
• American Public Works Association (APWA),
These organizations provide training and certification to ensure staff is able to safely and proficiently maintain the system. In 2024, staff members received 2 new certifications and 4 re-certifications.
Conclusion
As staff reviews the past year’s performance of the sewer system, the maintenance, investigation, and prevention programs are proving to continue to be successful. Expansion of preventive programs, specifically community outreach and the FOG program, are continuing to be evaluated and will be implemented as they are developed. Additionally, new asset management software systems are beginning to roll out and will aid in the scheduling and tracking of maintenance in order to ensure a complete, system -wide approach. The capital improvement program provides assurance that our system will be successful for future generations and is constantly being evaluated and updated with the most current and urgent needs. The staff of the Utility Services Section is proud to provide such a vital service to the residents and businesses of the community and will continue to remain proactive in order to safeguard one of the City’s major assets.
NEVER POUR GREASE DOWN THE DRAIN. PUT IT IN A CAN
OR SOAK IT UP IN A PAPER TOWEL AND PUT IT INTO THE
TRASH OR SAVE YOUR GREASE & DELIVER TO CITY
MAINTENANCE YARD AT
615 W. AVENUE H, FOR RECYCLING.
Sewer Collection System Annual Report
2024 Annual Sewer District Revenue Sources
The City collects sewer fees from a variety of sources; however, the overwhelming majority of revenue comes from property owners whose properties are connected to the sewer system. As shown in the exhibit below, the City collects over $4.4 million in sewer charges; these funds are used for the care of the system and the specialized equipment required to properly clean and inspect the asset.
$1,353
$1,630
$99,217
$10,422
$34,116
$4,492,009
$- $1,000,000 $2,000,000 $3,000,000 $4,000,000 $5,000,000 Inspections
FOG Plan Review
FOG Annual Fee
FOG Application Fee
Developer Fees
Tax Revenue
Sewer Collection System Annual Report
2024 Annual Sewer Maintenance Activity at a Glance
Man Holes
Inspected,
1,975
Man Holes
Repaired, 10
Vermin
Abatement, 115
MAN HOLE ACTIVITY
Man Holes Inspected
Man Holes Repaired
Vermin Abatement
Pipe Flushing
LF, 568,987
Root Removal
LF, 4,546
CCTV Inspection
LF, 123,008
PIPELINE ACTIVITY, LINEAR FEET
Pipe Flushing LF
Root Removal LF
CCTV Inspection LF
Sewer Collection System Annual Report
Sewer System Performance Review
Sewer System
Performance 2018/2019 2019/2020 2020/2021 2021/2022 2022/2023 2024 Pipe Cleaning:
Pipe Flushing 463,198 LF or
87.73 Miles
507,175 LF or
96.06 Miles
546,715 LF or
103.05 Miles
515,202 LF or
97.58 Miles
610,226 LF or
115.57 Miles
568,987 LF or
107.76 Miles
Root Removal
8,397 LF or
1.59 Miles
14,843 LF or
2.81 Miles
3,290 LF or
0.62 Miles
3,994 LF or
0.76 Miles
4,701 LF or
0.89 Miles
4546 LF or
0.86 Miles
Closed-Circuit TV
Inspection:
52,847 LF or
10.01 Miles
188,507 LF or
35.70 Miles
111,749 LF or
21.16 Miles
137,117 LF or
25.97 Miles
142,303 LF or
26.95 Miles
123,008 LF or
23.30 Miles
Manholes:
2,909
4,679
3,172
3,020
2638
1975
Inspected
Repaired
4 11
5 0
3 10
Vermin Abatement
1,560
1,244
454
470
462
115
Sewer Overflow (SSOs):
2 0
0 2
1 2
Annual SSO Rate
(SSO/100 miles of pipe)
.47
0 0
.46
.25
.46
Portion of SSO Runoff
Contained
51%
N/A
N/A
100%
100%
100%
Main SSO Causes
Grease
N/A
0%
0%
90%
50%
50%
Roots
N/A
0%
0%
0%
0%
0%
Other (Vandalism, etc.)
100%
N/A
N/A
10%
50%
50%