S/N Parameter(s) Pond Water Standards (NOAA)*
Acute Chronic
1 Temp°C 28   ≤15˚C Acceptable maximum [38]
2 Conductivity Us/cm3 348   250 mS/cm [38]
3  pH 6.72   Desirable: 6.5-8.5 [38]
4 Salinity (mg/l) 160 - -
5 TDS (mg/l) 230 - -
6 ORP mV 115 - -
7 Turbidity (JTU) 10 - Desirable: less than 5 NTU [38]
8 Nickel, Ni 0.064 0.47 0.052
9 Chromium, Cr (mg/l) 0.267 0.016 0.011
10 Cadmium, Cd (mg/l) <0.001 0.002 0.00025
11 Lead, Pb (mg/l) <0.001 0.0651  0.0025
12 Zinc, Zn (mg/l) 0.295 0.12 0.12
13 Calcium, Ca (mg/l) 39.454 - -
14 Magnesium, Mg (mg/l) 4.230 - -
15 Sodium, Na (mg/l) 31.007 - -
16 Potassium, K (mg/l) 25.840 373 -
17 PAH (mg/l) 0.006 0.3 -
18 Phosphate PO43- (mg/l) 1.05 < 0.10 (PO4) [39] < 0.10 (PO43-)[39]
19 Sulphate, SO43- (mg/l) 7 - -
20 Nitrate, NO3- (mg/l) 2.0 50[39] 50[39]
21 BOD (mg/l) 0.265 class I fisheries ≤ 1
class II fisheries ≤ 2
class III fisheries ≤ 3
(Japanese EWQS)
class I fisheries ≤ 1
class II fisheries ≤ 2
class III fisheries ≤ 3
(Japanese EWQS)
22 DO (mg/l)(lab) 2.12 >5 >5
23 Alkalinity (mg/l) 42.5 ≥ 20 [39] ≥ 20 [39]
24 Hardness (mg/l) 36.0   Desirable: 150-500 [38]
Table 1: Surface water results and standards.