Clean Waters

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					                                 Clean Waters
                                                    Starting in Your Home and Yard

                                                     Caring for Your Septic System
                                                   When you flush your toilet, or         shown to contribute to contamination of ground-
                                             pour something down your drain, do           water by toxic chemicals. Contaminants that may
                                         you know where it goes? If your home is not      enter groundwater through septic systems
                                 on a municipal or community system, your waste-          include heavy metals and toxic chemicals from
Clean Waters is a                water probably goes into an on-site sewage dis-          small commercial establishments, toxic house-
collaboration of the             posal system, commonly called a septic system. A         hold products, and organic chemicals typically
Connecticut Sea                  septic system is designed to collect, treat and dis-     found in septic tank cleaning products.
Grant Extension
                                 pose of wastewater on site so that it can percolate
Program and the
University of                    into the ground without clogging the soil or conta-         How Does A Septic System Operate?
Connecticut                      minating ground or surface waters.
Cooperative                         In Connecticut, nearly 40% of homes use some
                                                                                             Most systems have two main components: the
                                 form of on-site sewage disposal system to treat          septic tank and the leach field. A distribution box
SystemÕs NEMO
Project, educating               and dispose of household wastewater. When                is often found between these two components
individuals about                properly sited, designed, installed and maintained,      to distribute wastewater to all parts of the leach
the impacts of                   a septic system can be a cost-effective method of
everyday activities
                                 wastewater treatment. However, since wastewater             The septic tank receives the wastewater and
on water quality
and simple tech-                 disposal is something most of us don’t spend             provides a site for the solids to separate and set-
niques that help                 much time thinking about, many systems are out           tle and for some decomposition of solids and
protect water                    of date, not functioning properly, or clearly failing.   contaminants to occur. Heavy solids settle to the
resources from the                  Domestic wastewater contains several kinds of
home well to Long                                                                         bottom of the tank forming a layer of sludge.
Island Sound.                    pollutants. The major pollutant is the pathogens         Lighter solids, like grease, float to the top form-
                                 (disease-causing microorganisms) like the bacte-         ing a layer of scum. The wastewater in the mid-
                                 ria and viruses that cause dysentery, hepatitis, and     dle is pushed out into the leach field as more
                                 typhoid fever. Fortunately, soil and soil bacteria       wastewater moves into the tank. Solids need
                                 can effectively remove most pathogens from               time to settle to prevent them from being pushed
                                 wastewater treated by a properly functioning sep-        out into the leach field and they also need to be
                                 tic system.                                              periodically pumped from the tank. A properly
                                    When nutrients such as nitrogen and phospho-          sized tank will hold 2-3 days worth of wastewater
                                 rus are discharged from septic systems into the          to allow for proper settling. A two-chambered

                                 groundwater, they can contaminate drinking water         tank allows for more complete settling of solids
                                 supplies, and also represent a potentially impor-        because there is less turbulence in the second
                                 tant nonpoint source of pollution to ponds,              chamber, resulting in cleaner water leaving the
                                 streams, and estuaries such as Long Island               tank.
                                 Sound. In freshwater systems, phosphorus causes             The leach field consists of trenches or a bed,
                                 excessive aquatic weed growth that can limit the         often lined with gravel or coarse sand, and is
                 December 1999
    Fact Sheet

                                 uses of ponds and lakes. In the Sound, excess            buried one to three feet below the surface of the
                                 nitrogen fuels massive algal blooms, which in turn       ground.
                                 die, using up oxygen as they decompose.                     Perforated pipes or drain tiles run through the
                                    The improper use of septic systems has been           trenches. Wastewater trickles from the perforat-

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                                                                                                                                          water entering the system, the
                                                                                                                                          less turbulence and better set-
                                                                                                                                          tling that will occur. For example,
                                                                                                                                          decrease the amount of water
                                                                                                                                          going into the tank by spreading
                                                                                                                                          out water-using activities (like
                                                                        SEPTIC SYSTEM                                                     laundry) during the course of the
                                                                                                                                          week. Install low-flow shower-
                                                   WATER TABLE                                                                            heads, use a “toilet tummy” or a
                redrawn from LISS fact sheet #13

                                                                                                                                          half-gallon milk jug filled with
                                                        GROUNDWATER                                                                       water in the toilet tank and
                                                                                                move toward                               encourage short showers in the
                                                    MOVEMENT                                    water body                                household.
                                                                                                                                              Lastly, protect the leach field.
                                                     Groundwater can transport biological, chemical and nutrient contami-                 Avoid compacting the soil or
                                                     nants to nearby surface waters.                                                      crushing the pipes. Don’t let
                                                                                                                                          heavy vehicles or animals cross
                                                                  ed pipes through the gravel and into the soil,       the leach field; don’t place heavy objects like
                                                                  which acts as a biological filter. Microorganisms    swimming pools or storage sheds over the field.
                                                                  found in the soil, and the soil itself, continue the Also, avoid planting trees within the leach field as
                                                                  treatment process begun in the tank by remov-        the roots can cause damage to the system.
                                                                  ing harmful organisms, organic matter and            Grass is the best thing to grow over the leach
                                                                  some nutrients.                                      field.
                                                                                                                          Maintenance means inspection and pumping
                                                                      Care and Maintenance of the System               of the tank. An inspection should include check-
                                                                                                                       ing sludge and scum levels as well as checking
                                                                     Proper siting, design and installation are all    baffles to be sure that they have not been dam-
                                                                  critical to the proper functioning and long life of  aged.
                                                                  a septic system. The owner/user of that system          Tank pumping is needed to remove the solids
                                                                  plays an equally important role. Using preventive    that cannot be broken down by bacteria and
                                                                  practices, maintaining the system and watching       which should not enter the leach field. Frequency
                                                                  for signs of failure are key.                        of pumping will depend upon the number of
                                                                     Preventive practices include (a) improving the    members in the household as well as the tank
                                                                  quality of wastewater; (b) reducing the amount       size. The state of Connecticut Department of
                                                                  of wastewater, and (c) protecting the leach field.   Public Health recommends pumping every 3-5
                                                                  Simply put, use care in what you put into the        years. Some towns in Connecticut require routine
                                                                  system. It was designed for one purpose and          pumping. Keep maintenance records, using
                                                                  one purpose treat wastewater exiting       something like the attached record-keeping chart,
                                                                  the home.                                            to avoid the “out of sight, out of mind” problem.
                                                                     Do not use the wastewater disposal system             A failing system can result in the spread of dis-
                                                                  as a wastebasket, household chemical disposal        ease from improperly treated wastewater/
                                                                  site, or use unnecessary additives in your sys-      sewage. You should be able to recognize the
                                                                  tem. Also, the use of a garbage disposal further     signs of a failed system and be prepared to act to
Fact Sheet #3

                                                                  taxes the system. IF you use a garbage dispos-       correct problems. If you experience sewage
                                                                  al, your septic tank should be pumped more fre-      backup in drains or toilets, slowly draining sinks,
                                                                  quently.                                             tubs and toilets, foul odors, repeated intestinal ill-
                                                                     Conserve water where possible. The less           nesses in household members, standing waste-

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          water or soggy areas on the ground above or
                                                                 Tank                                Household Size
          near the septic system, or excessive growth
                                                                 size                            (number of people)
          of lush, green plants over the leach field even
          during dry weather, your septic system is
                                                                (gals.)              1         2      3     4     5                  6
          probably failing.                                      500                5.8       2.6    1.5  1.0    0.7                0.4
                                                                 750                9.1       4.2    2.6  1.8    1.3                1.0
                                                                 900               11.0       5.2    3.3  2.3    1.7                1.3
                   Use of Additives                             1000               12.4       5.9    3.7  2.6    2.0                1.5
                                                                1250               15.6       7.5    4.8  3.4    2.6                2.0
             There are several types of septic system           1500               18.9       9.1    5.9  4.2    3.3                2.6
          additives available. Generally, additives are         1750               22.1      10.7    6.9  5.0    3.9                3.1
          marketed to: digest or “liquify/gasify” the           2000               25.4      12.4    8.0  5.9    4.5                3.7
          solids in a septic tank; rejuvenate stressed          2250               28.6      14.0    9.1  6.7    5.2                4.2
          bacterial populations in the tank; and/or             2500               31.9      15.6 10.2    7.5    5.9                4.8
          increase “settleability” of solids in the tank.       Estimated septic tank pumping frequencies in years.
          Though some of the products may do what               These figures assume there is no garbage disposal unit in use.
          they suggest, the necessity of such additives         (Source: Pennsylvania State University Cooperative Extension Service)
          is not proven. Others, though harmless to the
          system, are ineffective. Others still may actual-
          ly prove damaging, particularly to the leach
          field and the soils.                                Sources:
             In Connecticut, the State Department of          Long Island Sound Study, “The Impact of Septic
          Public Health does not recommend the use of         Systems on the Environment,” Fact Sheet #13,
          additives. The U.S. Environmental Protection        September 1991.                                                   The Connecticut
                                                                                                                                Sea Grant College
          Agency also does not recommend the use of                                                                             Program, based at
          these products.                                     The University of Rhode Island Department of
                                                                                                                                the University of
             If you have questions about the location of      Natural Resources Science, “Maintaining Your                      Connecticut, is
          your septic system, contact your local health       Septic System”, Fact Sheet 88-2, April 1988.                      part of a national
                                                                                                                                network of univer-
          department. Also, be sure to maintain records                                                                         sity-based pro-
          of location, pumping, maintenance or repair         “Small Flows” Newsletter, Spring 1997, Vol. 11,
                                                                                                                                grams sponsoring
          should you decide to sell your property. A          No. 2, ‘Septic Tank Additives’, page 10.                          coastal and
          savvy buyer will want to have confidence in                                                                           marine-related
          the status of your home’s septic system.            Written by-                                                       research, outreach
                                                                       Karen K. Filchak                                         and education.
                                                                       Extension Educator
                                                                       University of Connecticut
                                                                       Cooperative Extension System
                 Use the record sheet on
                 the back page to keep
                 track of your septic
                 system’s location and
                                                                                                                                             Fact Sheet #3

                 maintenance.                                 For more information contact: Connecticut Sea Grant,
                                                              1084 Shennecossett Rd. Groton, CT 06340

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                                                                                         Record Sheet
                                                                                         Septic System Layout

                                                                                            If you do not have a sketch of your septic
                                                                                         system to place in this file, you should fill in the
                                                                                         space provided, showing the relative location
                                                                                         of your septic system components in relation
                                                                                         to your house.

            Date            Work Done                     Firm               Cost        Preventive Maintenance Record
           ___________________________________________________________________________     Keeping a record of your septic system
           ___________________________________________________________________________   maintenance experience will help you antici-
                                                                                         pate when the next cleaning may be needed.
                                                                                           If you should move, leaving a copy of this
           ___________________________________________________________________________   record will help the new homeowner.

                                             Your Septic System Pumper                          Your Septic System Installer

                                        Name_________________________________________      Name_________________________________________
Fact Sheet #3

                                        Address______________________________________      Address______________________________________
                                        Date Installed________________________________     Date Installed________________________________
                                        Phone_________________________________________     Phone_________________________________________

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