High-Tech Filtration Facilities

• Water Quality Test Status

  water quality test status

  Items	Legal Test		Present Test		Remarks
  	No. of Items	Test Cycle	No. of Items	Test Cycle
  Daecheongho Lake	-		11	Once a week (once a month)	City Water Technology Laboratory
  Water Source	- - 6 25	- Weekly Monthly Quarterly	6 13 37 37	6 Times per Day Weekly Monthly Quarterly	Filtration Plant Office City Water Technology Laboratory Same as Above Same as Above
  Influent	- -	Weekly Monthly	13 37	Weekly Monthly	Same as Above Same as Above
  Daily Test	6	At least once per day	7	Six times or more per day	Filtration Plant Office
  Weekly Test	8	At least once per week	21	At least once per week	City Water Technology Laboratory Filtration Plant Office
  Monthly Test	50	At least once per month	57	At least twice per month	City Water Technology Laboratory
  Quarterly Test	57	At least once per quarter	57	At least twice per month	City Water Technology Laboratory
  Monitoring Item Test	9 22	At least once per quarte At least once per year	145	At least once per quarter	City Water Technology Laboratory
  Aged Pipe	11	At least once per month	11 (15 points)	At least once per month	City Water Technology Laboratory
  Water Quality Test by Supply Step	12	At least once per quarter	12 (48 points)	At least once per quarter	City Water Technology Laboratory

High-Tech Water Quality Analysis Devices

• Water Quality Standard

  water quality standard

  No	Items	Standards	No	Items	Standards
  1	Bacteria	100CFU/mL or less	30	Toluene	0.7mg/l or less
  2	Total Coliforms	NOT Detected/100ml	31	Ethyl Benzene	0.3mg/l or less
  3	E. Coli	NOT Detected/100ml	32	Xylene	0.5mg/l or less
  4	Fecal Coliforms	NOT Detected/100ml	33	1.1-Dichloroethylene	0.03mg/l or less
  5	Pb	0.05mg/l or less	34	Carbon Tetrachloride	0.002mg/l or less
  6	F	1.5mg/l or less	35	1.2-dibromo-3-chloropropane	0.003mg/l or less
  7	As	0.05mg/l or less	36	Hardness	300mg/l or less
  8	Se	0.01mg/l or less	37	Consumption of KMnO4	10mg/l or less
  9	Hg	0.001mg/l or less	38	Odor	Odorless
  10	CN	0.01mg/l or less	39	Taste	Tasteless
  11	Cr+6	0.05mg/l or less	40	Cu	1mg/l or less
  12	NH4-N	0.5mg/l or less	41	Color	5 degree or less
  13	NO3-N	10.0mg/l or less	42	ABS	0.5mg/l or less
  14	Cd	0.005mg/l or less	43	Ph	5.8 - 8.5
  15	B	1.0mg/l or less	44	Zn	3mg/l or less
  16	Phenol	0.005mg/l or less	45	Cl-1	250mg/l or less
  17	THM	0.1mg/l or less	46	Re	500mg/l or less
  18	Chloroform	0.08mg/l or less	47	Fe	0.3mg/l or less
  19	Bromochloromethane	0.03mg/l or less	48	Mn	0.3mg/l or less
  20	Chlorodibromomethane	0.1mg/l or less	49	Turbidity	0.5NTU or less
  21	Diazinon	0.02mg/l or less	50	So4-2	200mg/l or less
  22	Parathion	0.06mg/l or less	51	Al	0.2mg/l or less
  23	Fenitrothion	0.04mg/l or less	52	Free Available Residual Chlorine	4.0mg/l or less
  24	Carbaryl	0.07mg/l or less	53	Chloral Hydrate	0.03mg/l or less
  25	1,1,1-Trichloroethane	0.1mg/l or less	54	Dibromoacetonitrile	0.1mg/l or less
  26	Tetrachloroethylene	0.01mg/l or less	55	Dichloroacetonitrile	0.09mg/l or less
  27	Trichloroethylene	0.03mg/l or less	56	Trichloroacetonitrile	0.004mg/l or less
  28	Dichloromethane	0.02mg/l or less	57	Haloacetic Acids	0.1mg/l or less
  29	Benzene	0.01mg/l or less

High-Tech Water Quality Analysis Devices

• Water Quality Test Items and Standards for the Water Source

  water quality test items and standards for the water source

  Items	Standards	Items	Standards
  Water Temperature	℃	Hg	-
  pH	6.5-8.5	Se	-
  BOD	-	Organic Phosphorus	-
  COD	2㎎/ℓor less	PCBs	-
  Suspended Solids	1㎎/ℓor less	Carbaryl	-
  Dissolved Oxygen	7.5㎎/ℓ or more	111-trichloroethane	-
  Total Coliforms	50/100mℓ or less	Tetrachloroethylene	-
  Fecal Coliforms	10/100mℓ or less	Trichloroethylene	-
  NH 3-N	-	Chlorophyll-a	5㎎/㎥or less
  NO3-N	-	Electrical Conductivity	-
  T-N	0.2㎎/ℓ or less	Cu	-
  T-P	0.01㎎/ℓ or less	Mn	-
  Sodium Lauryl Sulfate	-	Carbon Tetrachloride	-
  Phenol	-	1,2-dichloroethane	-
  CN	-	Dichloromethane	-
  F	-	Benzene	-
  As	-	Chloroform	-
  Cd	-	Antimony	-
  Pb	-	Diethylhexylphthalate	-
  Cr+6	-
  Remarks ※ The figure in parentheses of SS refers to water quality criteria. ※ If T-N/T-P is 7 or less, T-N is applied. If it is 16 or more, T-P is applied. ※ The criteria for T-N and T-P will NOT be applied to stream water.

Taps at Home

• Taps at Home

  taps at home

  Gu (District): Samples	Items	Test Cycle	Test Results
  Dong-gu: 44 Points Jung-gu: 46 Points Seo-gu: 44 Points Yuseong-gu: 26 Points Daedeok-gu: 20 Points	Bacteria, total coliforms, free available residual chlorine, pH, odor, taste, fecal coliforms, E. coli (8 items at 180 points)	Once a Month	Water quality test results amounting to 180 points: All items meet water quality standards.