23.1 No industrial effluent shall be disposed or exposed so as to cause nuisance and endanger to public health.

23.2 Without prejudice to the generality of the above provisions, the Competent Authority may stipulate certain conditions or measures  to control  the  air  borne emissions and  liquid  effluents  from  industrial units. These  measures  shall  be  stipulated   as conditions of the development permission.

23.3 Industries in the special industrial zone which emit liquid and gaseous effluents shall not be allowed to emit such effluent unless they are purified and rendered harmless from the public health point of view by provision of purification plants, as may be prescribed by the Competent Authority and/or the Gujarat Pollution Control Board.

23.4 Controls as prescribed from time to time by the pollution control board / Competent Authority shall be applicable to all development and redevelopment.


Regulations  for  regulating the construction  maintenance  and  control of  drains, sewers, drainage and sewage works  of   any  description within Development Area.


In these regulations unless the content specifically indicates   otherwise, the meaning of the terms used shall be as under:

1)“Sewer System” shall mean the sewage disposal system.

2)“Engineer” shall mean the Engineer of Authority or  the authorised  person   or its deputy or representative duly  authorised from time to time to act on his behalf.

3)“Person” shall mean any individual firm, company, association, society, corporation or group.

4)“Sewer” shall  mean a pipe, or conduct or other  construction provided for carrying sewage.

5)“Building Sewer” shall mean the sewer under the control of the property  owner  and extending from the building to  the  first      inspection chamber or manhole.

6)“Public sewer” shall mean a sewer in   which all    owners    of abutting   properties may discharge, and which is controlled  by  the public body.

7)“Sanitary Sewer” shall mean a sewer which carries sewage  and to which storm, surface and ground water are not admitted.

8)“Storm Sewer” shall mean sewer which carries storm and surface water  and drainage but excludes sewage and industrial  wastes, other than  unpolluted cooling water.

9) “Combined Sewer” shall mean a sewer receiving both sewage  and surface run off.

10) “Sewage”  shall  mean  a  combination  of  the  waters  carried    from  residences,    business    buildings, institutions   and   industrial   establishments, to go there with such ground surface and   storm waters as may be present.

11)“Industrial  waters”  shall  mean the  liquid  wastes from  industrial   manufacturing  process,  trade, business  or   form  of any  development,  recovery  or  processing  operation,  as   distinct  from  sanitary sewage.

12)“Garbage”  shall  mean  solid  wastes  from   the domestic and commercial  preparation,  cooking  and dispensing of food and from  the handling storage, and sale of produce.

13)“Properly Shredded Garbage” shall mean the waste from the preparation, cooking and dispensing of food that  have  been  shredded   to such a degree that all particles will be of   1   cm. carried freely under the flow conditions normally prevailing in sewers with no particle greater then 1 cm in any dimension.

14) “Sewage Treatment Plant” shall mean any arrangement or devices and structures used for treating sewage.

15)“Sewage works” shall mean all  facilities  for   collecting, pumping, treating and dispensing of sewage.

16) “Water  Course”  shall  mean  a  channel  in  which  a  flow  of     water  occurs  either  continuously  or intermittently.

17) “Natural Outlet” shall mean a channel in which a   flow   of ground water occurs continuously.

18) “Sludge” shall mean   any   discharge of   water    sewage industrial    waste    which   in   concentration   of any   given  constituent  or  in quantity of flow exceeds for  any  duration longer  than  15  minutes,  five times  the  average  24  hour  concentration or flow during normal operation.

19) “pH”  shall  mean the logarithm of the  reciprocal  of  the weight  of  hydrogeneous  in grams per  litre of  solution  as  determined by procedures outlined in standard methods.

20)  “Biochemical  Oxygen Demand” (abbreviated as  B.O.D.)  shall mean  the  quantity  of  oxygen  utilised in  the  biochemical  oxidation of organic matter in five days at 20 o c expressed in   milligrams per  liter, as  determined by procedures outlined in  standard methods.

21) “Suspended Solids” shall mean solids that either float on the surface  or are in suspension in water sewage or other  liquids  or  which  are  removable by  a  laboratory  filtering  device quantitative  determination shall be done  in  accordance  with methods.

22)“Gallon” shall mean Imperial Gallon.

23)“Control Manhole” shall be the manhole so designated for   the express   purpose of collecting   waste effluent  samples  and  facilitating observation and measurement of waste as  necessary from a property. It shall be the manhole at the junction of the building sewer with the public sewer or the nearest manhole on  the  public sewer down stream of the junction of  the  building sewer with the public sewer as may be decided by the Engineer.

24) “Standard Methods” shall mean the examination and  analytical procedures  set forth  in the most recent edition   of   Standard Methods' for the examination of water, sewage and Industrial wastes    published jointly  by  the  American  Public    Health      Association, the American Water Works Association and the Water Pollution  Control  Federation. However, the use  of  identical analytical procedure outlined by the  World  Health   Organisation  or  the  Indian  Standards  Institution  of  the  Government  of  India,  from time  time ,  whenever  such  procedures  exist  will   be     permitted.


1)It shall be unlawful for any person to place,  deposit,  or permit  to be deposited in any incinerate manner on   public   or   private property within the jurisdiction of Competent Authority any human   or animal excrement, garbage or other objectionable waste.

2)It  shall be unlawful for any person to  discharge  to  any natural  outlet  or  any  where,  within  the  area under   the   jurisdiction   of  Competent  Authority  any  sewage  or  other  polluted   waters   except  where suitable treatment has been provided in accordance  with subsequent provisions of these regulations.

3)For  permission to discharge into the sewage  system   from establishments  producing industrial wastes, the owner    or    his   authorised   agent   shall   make application on   a   special   form furnished   by   the Competent Authority as the case may  be.  The  permit   application shall be supplemented by any plans, specifications, sample   test reports or other information considered   pertinent   in the judgement of the Engineer. An inspection fee of Rs.100/-   for   an industrial building sewer permit shall be paid   at   the time application is filed. All  industrial  and trade  establishments  existing  and   discharging industrial wastes into the sewer system at the time of enactment of these regulations shall also require permission to discharge into the sewer under these regulations.

4)No  person shall discharge or cause to  be  discharged  any storm  water surface  water,  ground water, roof   run-off,   or   subsurface   drainage   to   any   sanitary   sewer.  uncontaminated  cooling   water   or unpolluted industrial process water be permitted   to   be   discharged   to any   sanitary   sewer   by   the Engineer if storm sewer is not available.

5)Storm water and all other unpolluted  drainage   shall   be discharged  to  such sewer as are  specifically designated  as  storm  sewers or to a natural outlet approved by the  Engineer. Industrial  cooling water or unpolluted process waters  may  be    discharged  with the prior approval of the Engineer to a  storm sewer or natural outlet.

6)Grease, oil and sand interceptors of  approved   type   and capacity shall be provided when in the opinion of the Engineer, they are   necessary for the proper handling of   liquid    wastes   containing   grease   in excessive amounts  or  any  inflammable   wastes,  sand or other harmful ingredients,  such  interceptors shall  be so located as to be readily accessible  for  cleaning   and inspection.

7)No storage rooms where acids, cyanide, cyanogen compound  or other  dangerous  substances are stored, shall  be  connected   directly to the public sewers or to any natural outlet,  curing  holding pit, or other approved arrangement may   be required   to   be   provided   so that accidental discharge can   be   caught and  disposed off in a safe manner.

8)All permits granted under Regulation No.24.2(3)  shall    be valid for a period of 3 years and it shall be incumbent on  the  owner  or  his  authorised agent to  make  an  application  for  renewal  with payment of renewal fee of Rs.75/-  three   months   before the 'expiry' of the permit period furnishing sample test reports  and any other information considered pertinent in  the   judgment of the Engineer.

9)No person shall discharge or cause to be discharged any   of the following described kinds of sewage, industrial or  factory  waste  into any sewer or body of water within or  entering  the  area;

i)Any liquid or vapor having a temperature higher  than 111 o F(45 o C).

ii) Any  water  or waste having a pH Lower  than  5.5  or higher than 9.5.

iii)Any water containing fats, wax grease, tars or  oils whether  emulsified  or  not, in excess  of  100 MG/L  or containing substance which may solidify or become  viscous  at temperatures between 32 of and 150 of (O 0 C and 65 o C).

iv)  Any petroleum products, fuel oil,   calcium   carbide benzene, hapthane, cleaning  solvents or other inflammable  or  explosive materials   in  liquid,  or  gaseous   form  and  having a flash point lower then 187 

v)Any   solid or viscous substances in quantities   or   of such   size   or   specific gravity as would   be

vi)capable of causing obstruction to the flow in sewers or other interference with the proper  operation of sewage work such  as, but not limited to, ashes, cinders, sand stone  dust, mud,   straw, shaving metal, glass, rags, feathers, star, plastics, wood fuller's earth, lime slurries and residues, pulp and paper mill wastes, ungrounded garbage, paper dishes, cups, food containers,  etc. either whole or grounded by garbage grinders.

vii)Any paunch manure or intestinal contents from animal, grease oil, hooves, toenails, bees, bristles, whole blood, fleshing and har resulting from slaughtering, tanning and other operations, which may cause difficulty to the sewer system.

viii)Any garbage that has not been properly shredded as defined in definition 24.1 (13). The  installation and operation of any garbage grinder equipped with a motor of 3/4 H.P.(0.76 H.P.) metric or greater shall be subject to review and approval of the engineer.

xi)Any soluble substances in such concentration as to increase the viscosity of the water or greater than 1:10 specific viscosity.

x)Any waters or water containing toxic, poisonous, solids, liquid or gases in sufficient  quantity either singly or by interaction with other wastes likely to injure or interfere with any sewage treatment process, constitute a hazard to human or  animals, create a  public nuisance  or create  any hazard in the receiving waters of the sewage treatment plant, including but not limited to:

a)Cyanides in excess of 2 Mg./L as CN;

b)Haxavelent chromium in excess of 3 Mg./L as GO;

c)total iron excess of MG./L as Fe.

Any waters or wastes containing constituents such as but not limited to the following objectionable limit which in the opinion of the Engineer are likely  to  interfere  with sewage treatment or  exceed limits after  treatment of  the sewage to meet the requirements of the  State,  or  other  public or local authorities for discharge to the receiving water:

Copper UPTO 3Mg/L
Zinc UPTO 15Mg/L
Lead UPTO 1Mg/L
Nickel UPTO 2Mg/L

xi)Any  waters  or  waste  containing  phenols  or  other  tastes  or  odor  producing  substances  in concentrations  exceeding  o.oo5 Mg/L.

xii)Any  radio active waste should not exceed  following limits: Radio active material:

i) Alpha                          -7
Emitters Max             1-0 mc/ml

ii) Beta                            -6
Emitters Max             1-0 mc/ml

xiii)Any malodorous gases and   acetylene    generation sludge.

xiv)Any water or waste containing  sulfides, sulphurdioxide,   nitrousoxide   or   any    of   the   halogens exceeding 10 Mg/L in concentration.

xv)Any water or waste containing sulphates in excess  of 1000 Mg/L concentration.

xvi)Any water or waste having B.O.D. more than 300 Mg/L.

xvii)Any water or waste having average suspended  solids more than 600 Mg/L.

xviii)Any water or waste having dissolved solids in excess of 2100 Mg/L concentration.

ixx)Any  water  or  waste  containing  following  elements  in  excess  of  respective  proportion  mentioned against them:

Parameters Standard-Mg/Lit.
Chloride (as Cl.)max 600
Fluoride 15
Ammonia Nitrogen(as N)max. 50
Boron(as B) max 2
% Sodium max 60
Free Ammonia (as NH) 5
Pesticide Absent.
Arsenic(as As) 0.2
Mercury (as Hg) 0.01
Cadnuyn (as cd) 2.0

xx)No person shall discharge or caused to be   discharged any    of   the following kinds of sewerage, industrial  or factory   waste  into  any  river  or  creeks,   exceeding      respective  levels as shown in Appendix attached,  at  the end of this chapter.

10)  No  person  shall discharge or  caused  to  be  discharged substances,  materials, waters or wastes, if it appears   likely in   the   opinion   of   the Engineer that   such   wastes   are   not   amenable to satisfactory treatment or can harm either  sewers, sewage treatment process or equipment have an adverse effect on the  reviving  stream or can otherwise  endanger  life,  limb, public  property,  or  constitute a nuisance. In  forming  his  opinion  as  to the acceptability of such wastes  the  Engineer  will  give consideration to  such  factors  as  the   quantities   of   wastes   in   relation   to  flows  and  velocities   in   the   sewers, materials  of construction of the sewers, nature of the  sewage  treatment  process, degree of treatability of wastes and  other pertinent factors.

11)   At such time as the sewage works are not overloaded,   the engineer   may   at   his   discretion   permit greater   degree   of pollution than set out in this regulation No.9(xvii) but in   no case exceeding the following:

a)   B.O.D. of 600 Mg/L. and

b)   Average suspended solids 1200 Mg/L.

12)  The permission mentioned in regulation will be given  only upon  payment  of  surcharge in addition  to the   usual  sewer charges,   and   it will be liable to the withdrawn on  3  months notice.  The  rates  for surcharge  will  be  decided  by  the Authority from time to time.

13)  If any waters  of wastes which  are  discharged,  or   are proposed  to  be discharged to the public sewers, contain  the substances  or  process  characteristics  enumerated  in  these  regulations and which in the judgment of the Engineer may have a deleterious effect upon the sewage works, processes,   equipment or  reviving  waters,  or  which  otherwise  create  a  hazard  to    life  or  constitute  a  public  nuisance,  the Engineer may:

a)  reject the wastes.

b) require pre-treatment in a  private   waste   treatment system  to an acceptable condition for discharge to the  public sewers.

c) require provision of flow equalizing   facilities  for control  over  the quantities and rates of discharge to  avoid  unusual volumes or flow or concentration of waste  constituting slugs as defined.

d) require payment of surcharge as detailed in   regulation 12 above.

14)   The owner shall   operate and   maintain   continuously    and effectively at his expense the private waste treatment of  flow equalization system in a sanitary and safe manner at all times.

15)   When  required  by  the  Engineer,  the  owner  of   any   property  serviced   by  a  building  sewer  carrying industrial wastes   shall   install a suitable control manhole together with such necessary   appurtenances in  the building  sewer  to  facilitate    observation  sampling    and    measurement    of  the  wastes.    Such manhole   when   required shall be accessible at all times. In a default of   the   owner   to   install   and maintain a  control  manhole  and  any required  appurtenance within 1 month of a written notice  from the Engineer to do so, the latter shall be entitled to estimate  the  quality and quantity in any manner or method  practicable  for  computing the amount of the surcharge and the presence  of  the objectionable constituents laid down in Regulation No.9, 10  and 11 above.

16) In the event that no special manhole has   been   required, the control manhole shall be connect to the nearest  down   stream        manhole  in  the  public  sewer  to  the  point  at  which  the   building   sewer  is connected.

17)   Sampling   shall be carried out to reflect the   effect   of constituents   upon   the   sewage   works   and   to determine  the existance of hazards to life, limb and property. The  particular  analysis  involved will at the  discretion  of  Engineer   be   done  either   on  basis  of  a  24  hours  composite  of  all  discharge  of   a property   or  as  a  grade  sample  or  samples.  Normally  B.O.D.   and  suspended     solids   analysis   are determined  from  24   hours  composites whereas pH is determined by grade samplings.

18)   All  tests  and  analysis  of  the  characteristics  of  water  and  wastes  to  which  reference  is  made  in  these Regulations  shall  be  determined  in  accordance  with  Standard  Methods  as  mentioned   in   definition 24.1(24) and shall be determined at the said control manhole  in  the  presence of representatives  of  all parties  concerned,  and tested at a Municipal or any  other  laboratory  approved by the Engineer.

19) The Engineer   may   at any time before or   after issue   of permit   or   grant of connection, run additional tests   of   the sewage or wastes being discharged by any trade or industry over   such   period as it may deem

necessary, cost of such test  shall be borne by the Competent Authority.

20)   In  the  event  of  taste  showing  greater  degree  of   pollution  than  permissible  under  the  Regulation  at No.24.2.9(xvi) and  (xvii); above  the surcharge, if any to be paid, shall be  computed  on  the  basis  of the latest test and shall be  levied  from  the  billing period in which the tests are carried out. If any  such testing by the Competent Authority shall show reduced degree of pollution   in   the wastes sufficient to exempt from payment  of  surcharge  the same shall become effective from the next billing period.

21)  If the owner is of the opinion that for  any  reason    the nature of the sewage presently being discharged into the  sewer  has  a substantially lessened degree of pollution than as  shown  by  prior tests, he may request the Competent Authority to make new  test  more   than  once  in each billing period to  be  made at  his expense.  Such  test  will  be taken by  the  Engineer  at  his discretion within three months from the date of application. If   the   Engineer is satisfied that such tests were made   when   the   plant was operating  under  normal  conditions,  the  results  of  the  latest    tests  shall  be  used  in  computing  or exempting from  the surcharge.

22) The Engineer or other duly authorised   employees   of    the Competent Authority   shall be permitted to enter all properties   for   the   purposes   of inspection, observations of these regulations   and having   a direct bearing on the nature and source of  discharge.

23)  Any person found to be violating any provision  of  these regulations  shall  be  served by the  Competent Authority  with  written notice  stating the violation and providing a  reasonable  time limit  not less than one month for the satisfactory  correction thereof. The offender shall within the period of time stated in such notice, permanently cease all violations.

24)  Any person who shall continue any violation beyond the time limit,  provided for in regulation24.2.(23) above, shall   be   liable for prosecution and be punished with a fine which may extend to Rs.500/- for each violation and in case of a continuing  breach   to Rs.50/- per day after the date of first conviction.

25)   Any   person   violating  any  of   the   provisions   of   these   regulations   shall   become   liable  to   the Competent Authority   for   any expenses,   loss   or damage occasioned to the Competent Authority   by the  reason   of   such violation and  shall be liable   to   suspension, revocation   or   cancellation,  if  any permissions  were  granted  under the regulations.

26)   Should any court of competent jurisdiction    declare  any provision of this regulation ultravires then the decision shall   effect   only   such provision so declared to be   ultravires   and   shall not effect any other provisions.

27)  The above  mentioned  Regulations  shall  be  subject    to modification from time to time as required by Gujarat Pollution Control Board and Competent Authority.


(i)  Location and sub-soil dispersion.-A sub-soil dispersion system shall not be closer than 12 mts. to any source of drinking water, such as a well, to mitigate the possibility of bacterial pollution of water supply. It shall  also be as far removed from the nearest habitable building is economically feasible but not closer than 2 mts. to avoid damage to the structure.

(ii)    Dimensions etc. (iii)

(a)  Septic tank shall have a minimum inner width of 75 cm. a minimum depth of -meter below the water level and a per capital minimum liquid capacity of 85 liters. The length of the tanks shall be least twice the width.

(b) Septic tanks may be constructed of brick work, stone masonary, concrete or other suitable material as approved by the competent authority..

(c) Under no circumstances should effluent from a septic tank or allowed into an open channel  drain or body of water without adequate treatment.

(d) The  minimum  normal  diameter  of  the  pipe  shall  be  100  mm.  Further  at  junction  of  pipes  in manholes, the direction   of flow from a branch connection should not make an angle exceeding 45 with the direction of flow in the main pipe.

(e)The  gradients  of  land-drains,  under-drainage  as  well  as  the  bottom  of  dispersion  trenches  and soakwells should be between 1:300 and 1:1400.

(f)Every septic tank shall be provided with a ventilating pipe of at least  50 mm. diameter. The top of the pipe shall be provided with a suitable cage of mosquito proof   wire mesh. The ventilating pipe shall  extend  to height which  would  cause  no  smell  or  nuisance  to  any  building  in  the  area. Generally,  the  ventilating  pipe  should  extend  to  a    high  of  about  2  mts.  above  the  septic  tank building when it is located closer than 15 mts.

(g)   When the disposal of a septic tank effluent is to a seepage pit, the seepage pit may be of sectional dimension of 90 cm. and not less than 100 cm. in depth below the inner level of the inlet pipe. The pit may be lined with stone, brick and concrete blocks with dry open joint which should be backed with at least 7.5 cm. of clean  coarse aggregate. The lining above the inlet level should be narrowed to reduce the size of the R.C.C. cover slabs. Where no lining is used, Specially near trees the entitle pit should be filled with loose stones. A masonary ring should to constructed at the top of the pit to prevent damage by flooding of the pit by surface run off. The inlet pipe should be taken down to a depth of 90 cm. from the top an anti Mosquito Measure.

(h)When the disposal of septic tank effluent is to a dispersion trench, the dispersion trench shall be 50 to 100 cm. wide excavated to a slight gradient and shall be provided with a layer of shed gravel or crushed  stones  15  to  25  cm.  deep.  Open  joined  pipes  placed  inside  the  trench  shall  be  made  of unglazed earthenware clay or concrete and shall have a minimum internal diameter or 70 to 100 mm. Each dispersion trench should not be longer than 30 mts. and trenches should not be placed
closer than 1.8 mts. to each other.

24.4The above mentioned Regulations shall be subject to modification form time to time as required by Gujarat Pollution Control Board/Ahmedabad Municipal Corporation/Competent Authority