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The water and sewer network of any city is fundamental to the health and safety of citizens as well as their quality of life and the operation of the city and the environment that surrounds it. The Cities of New York and Chicago are no exception.
The sewer system under the streets and buildings of NYC collects stormwater from buildings as well as sewage. The sewers in this system are connected to larger trunk sewers that are connected to even larger interceptor sewer that carries wastewater from smaller pipes to the City’s 14 water waste treatment plants (WWTP).
About half of NYC’s land area has a combined sewer system that conveys sanitary sewage and industrial wastewater as well as stormwater. There are no problems when the weather is dry and the combined sewers operate successfully as sanitary sewers, conveying this waste material to the WWTPs. But in wet weather, there is a danger that large volumes of rainwater runoff may enter the system. Since the WWTPs were designed to handle only about double the dry-weather flow, engineers have designed regulators that are built into the combined sewers, and which act as relief valves. This avoids flooding the WWTPs. But what happens during storms is that when the combined sewage-rainwater flow reaches the regulators, the excess water is directed into the nearest waterway, the Hudson River for example. This untreated overflow is known as combined sewer overflow (CSO).
CSO is a major concern. In addition to untreated sewage, it contains street garbage and other pollutants like oil and gasoline, as well as pollutants from various industrial facilities. As a result, NYC is doing all it can to upgrade and improve its water and sewer infrastructure and comply with the Federal Clean Water Act that sets CSO standards.
Of course, most of the other 50% of NYC’s land area, including parts of Staten Island and Queens, are served by separate stormwater drains and sewers. These convey sanitary sewage to the WWTPs and untreated stormwater through separate sewers to the nearest waterways.
But there are also parts of Queens, Brooklyn, and south-western Staten Island that don’t yet have access to the City’s sanitary sewer system. In these areas, there are septic systems with underground tanks.
Like NYC, Chicago has CSOs. Their solution is the Tunnel and Reservoir System Plan (TARP) that holds stormwater in reservoirs until the City’s wastewater treatment plants have the capacity to treat it. This effectively prevents raw sewage being discharged into the Chicago River – which is what used to happen.
When it comes to connecting to NYC’s sewers, certification is required from the Department of Environmental Protection (DEP) that manages the City’s water supply as part of the building permit process. This is where professional engineers like us come in.
Before a building permit can be issued the DEP has to certify that there is sewer availability for the house or site. There must also be sufficient capacity in downstream sewers to accommodate the discharge. If there isn’t sufficient capacity either in the sewer that fronts the property and/or the downstream sewers, sewer extensions or infrastructure improvements may be required. On-site retention and/or detention systems may also be needed to improve sanitary and stormwater flow before a sewer connection is approved.
We handle sewer availability certification and all our design work is 100% compliant with the NYC Environmental Protection Sewer Design Standards. We also coordinate with the DEP’s Bureau of Environmental Planning and Analysis (BEPA) to ascertain as soon as possible what the available capacity is and whether there are any possible improvement needs.
Sometimes, the construction of new sewers and other improvements to the water and sewer infrastructure requires an amendment to the City’s existing drainage plan. This issue is considerably more complicated, lengthy, and inevitably more costly than a standard new sewer service application.
Amended drainage plans (ADPs) indicate the design and construction of new sewers and show new pipes are aligned with the existing system. They must be drawn up in terms of zoning designations and topography, as well as the existing sewer system capacity and current drainage. It is the responsibility of the DEP to review the ADP and decide whether to approve or deny the application.
Septic systems must be approved by the NYC Department of Buildings (DOB) and the New York State Department of Health (NYSDOH). If a septic system is at a commercial or industrial site, or it processes more than 1,000 gallons of wastewater each day, a State Pollutant Discharge Elimination System (SPDES) permit is required from the NYS Department of Environmental Conservation (DEC).
is available to design ADPs for developers and will coordinate all the necessary filings and permits for sewers and septic tanks.
It is the responsibility of NYC’s DEP to provide all residents with water that is clean and safe and to manage and dispose of wastewater. The DEP also has the task of maintaining the water supply and water delivery systems, as well as the sewer system and wastewater treatment plants. Additionally, the Department controls connections to the City’s water and sewer systems.
When it comes to new sewer services, the DEP and utility companies require NYS licensed professional engineers or NYS registered architects to prepare and file for all new utility services including a new sewer service and site or house connection.
All proposed connections must comply with the most recent DEP rules and regulations including current sewer design standards. The design of the sewage system must be shown in plan and section together with the proposed installation plan for blue roof detention or detention tanks if these are required.
The NYC DEP has detailed proposal forms for both site connections and house connections. The house connection proposal application is for one, two, and three family homes with individual connections to existing sewers that front the property and do not have any “common” drainage facilities. It does not apply to commercial premises. The site connection form is for all other developments. The application and plans must be submitted together with all the necessary supporting documents including calculations, consents, boring logs, and so on.
All submissions are made by us to the Bureau of Water and Sewer Operations of the DEP.
