Big Bend Water Quality Summary
| Substance | Average Value | MCL | Units |
|---|---|---|---|
| ALKALINITY, as HCO3 | 130 | N/A | ppm |
| ALPHA EMITTERS | 3.3 | 15 | pCi/L |
| ALUMINUM | <10.0 | 200 | ppb (1) |
| ANTIMONY | <0.8 | 6 | ppb |
| ARSENIC | 1.5 | 10 | ppb |
| BARIUM | 0.1 | 2 | ppm |
| BERYLLIUM | <0.8 | 4 | ppb |
| BROMATE | 5.7 | 10 | ppb |
| BROMIDE | <20 | N/A | ppb |
| CADMIUM | <1.0 | 5 | ppb |
| CALCIUM | 76 | N/A | ppm |
| CHLORIDE | 113 | 400 | ppm (1) |
| CHLORINE RESIDUAL | 0.70 | 4.0 (2) | ppm |
| CHROMIUM | <6.0 | 100 | ppb |
| COLIFORM, TOTAL | 0 | ≤1 | number samples positive per month |
| COLOR, True | 2 | 15 | PCU (1) |
| CONDUCTIVITY | 1081 | N/A | µS/cm |
| COPPER | <10 | 1 | ppm (1) |
| CYANIDE | <25 | 200 | ppb |
| FLUORIDE | 0.36 | 4.0 2.0 |
ppm ppm (1) |
| HALOACETIC ACIDS (Total Regulated) | 17 | 60 | ppb |
| HARDNESS | 300 18 |
N/A | ppm gpg |
| IRON | <50 | 600 | ppb (1) |
| LEAD | <0.6 | N/A | ppb |
| MAGNESIUM | 27 | 150 | ppm (1) |
| MANGANESE | <10.0 | 100 | ppb (1) |
| MBAS | <100 | 500 | ppb (1) |
| MERCURY | <0.2 | 2 | ppb |
| MOLYBDENUM | 5.1 | N/A | ppb |
| NICKEL | <10 | N/A | ppb |
| NITRATE (as NITROGEN) | 0.51 | 10 | ppm |
| NITRITE (as NITROGEN) | <0.02 | 1 | ppm |
| ODOR | 1 | 3 | TON (1) |
| ORTHO PHOSPHATE, as PO4 | 0.07 | N/A | ppm |
| PERCHLORATE | 1.9 | N/A | ppb |
| pH | 8.1 | 6.5 - 8.5 | pH units (1) |
| POTASSIUM | 5.9 | N/A | ppm |
| RADIUM 226 AND RADIUM 228 (Combined) | <0.4 | 5 | pCi/L |
| SATURATION INDEX | 0.61 | N/A | N/A |
| SELENIUM | 2.1 | 50 | ppb |
| SILICA | 7.0 | N/A | ppm |
| SILVER | <10 | 100 | ppb (1) |
| SODIUM | 104 | N/A | ppm (3) |
| SULFATE | 241 | 500 | ppm (1) |
| TEMPERATURE | 23 | N/A | deg C |
| THALLIUM | <0.4 | 2 | ppb |
| TOTAL DISSOLVED SOLIDS | 657 | 1000 | ppm (1) |
| TRIHALOMETHANES (Total) | 45 | 80 | ppb |
| TURBIDITY | 0.08 | 0.3 | NTU (4) |
| URANIUM | 4.2 | 30 | ppb |
| VANADIUM | <10 | N/A | ppb |
| ZINC | <10 | 5000 | ppb (1) |
| Substance | Average Value | MCL | Units |
|---|---|---|---|
| 1,2,4-TRICHLOROBENZENE | <0.5 | 70 | ppb |
| 1,1,1-TRICHLOROETHANE | <0.5 | 200 | ppb |
| 1,1,2-TRICHLOROETHANE | <0.5 | 5 | ppb |
| 1,1-DICHLOROETHYLENE | <0.5 | 7 | ppb |
| 1,2 DICHLOROPROPANE | <0.5 | 5 | ppb |
| 1,2 -DICHLOROBENZENE | <0.5 | 600 | ppb |
| 1,2-DICHLOROETHANE | <0.5 | 5 | ppb |
| 1,4 -DICHLOROBENZENE | <0.5 | 75 | ppb |
| 2,3,7,8-TCDD (DIOXIN) | <0.005 | 0.03 | ppt |
| 2,4-D | <0.1 | 70 | ppb |
| ALACHLOR | <0.1 | 2 | ppb |
| ATRAZINE | <0.1 | 3 | ppb |
| BENZENE | <0.5 | 5 | ppb |
| CARBOFURAN | <0.5 | 40 | ppb |
| CARBON TETRACHLORIDE | <0.5 | 5 | ppb |
| CHLORDANE | <0.1 | 2 | ppb |
| CHLOROBENZENE | <0.5 | 100 | ppb |
| cis-1,2-DICHLOROETHYLENE | <0.5 | 70 | ppb |
| DALAPON | <1 | 200 | ppb |
| DI (2-ETHYLHEXYL) ADIPATE | <0.6 | 400 | ppb |
| DI (2-ETHYLHEXYL) PHTHALATE | <0.6 | 6 | ppb |
| DIBROMOCHLOROPROPANE | <0.01 | 0.2 | ppb |
| DICHLOROMETHANE | <0.5 | 5 | ppb |
| DINOSEB | <0.2 | 7 | ppb |
| DIQUAT | <0.4 | 20 | ppb |
| ENDOTHALL | <5 | 100 | ppb |
| ENDRIN | <0.01 | 2 | ppb |
| ETHYLBENZENE | <0.5 | 700 | ppb |
| ETHYLENE DIBROMIDE | <0.01 | 0.05 | ppb |
| GLYPHOSATE | <6 | 700 | ppb |
| HEPTACHLOR EPOXIDE | <0.01 | 0.2 | ppb |
| HEPTACHLOR (H-34, HEPTOX) | <0.01 | 0.4 | ppb |
| HEXACHLOROBENZENE | <0.1 | 1 | ppb |
| HEXACHLOROCYCLOPENTADIENE | <0.1 | 50 | ppb |
| LINDANE | <0.02 | 0.2 | ppb |
| METHOXYCHLOR | <0.1 | 40 | ppb |
| MTBE | <0.5 | N/A | ppb |
| OXAMYL (VYDATE) | <0.5 | 200 | ppb |
| PAHs (benzo(a)pyrene) | <0.02 | 0.2 | ppb |
| PENTACHLOROPHENOL | <0.04 | 1 | ppb |
| PICLORAM | <0.1 | 500 | ppb |
| POLYCHLORINATED BIPHENYLS | <0.1 | 0.5 | ppb |
| SILVEX (2,4,5 - TP) | <0.2 | 50 | ppb |
| SIMAZINE | <0.1 | 4 | ppb |
| STYRENE | <0.5 | 100 | ppb |
| TETRACHLOROETHYLENE | <0.5 | 5 | ppb |
| TOLUENE | <0.5 | 1000 | ppb |
| TOXAPHENE | <0.5 | 3 | ppb |
| trans-1,2 DICHLOROETHYLENE | <0.5 | 100 | ppb |
| TRICHLOROETHYLENE | <0.5 | 5 | ppb |
| VINYL CHLORIDE | <0.5 | 2 | ppb |
| XYLENES | <0.5 | 10,000 | ppb |
Footnotes:
- State of Nevada Secondary Standard
- MRDL
- Monitoring requirement only, no MCL
- Treatment technique requirement
Terms:
"<" - less than
µS/cm - Micro Siemens per centimeter
Action Level - 90 percent of sample results must be less than this level
gpg - grains per gallon
MCL - Maximum Contaminant Level Set by EPA
MRDL - Maximum Residual Disinfectant Level
N/A - Not applicable, No Standard Set
NTU - Nephelometric Turbidity Unit
pCi/L - picocuries per liter
PCU - Platinum Cobalt Units
ppb - parts per billion
ppm - parts per million
ppt - parts per trillion
TON - threshold odor number