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12/5/2024 |
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Note: Drinking water limits are based on U.S. Environmental Protection Agency primary and secondary standards for public water supplies ( http://www.epa.gov/safewater/mcl.html). Stock water and irrigation water recommendations are from U.S. Department of Agriculture Natural Resources Conservation Service water-quality guidelines. The guidelines are general and may vary depending on specific applications. Irrigation guidelines are based on continuous irrigation. (mg/L = milligrams per liter, ug/L = micrograms per liter).
Commonly occurring metals and other constituents | |||
---|---|---|---|
Constituent | Drinking water limits (mg/L) | Stock water limits (mg/L) | Irrigation water limits (mg/L) |
Calcium (Ca) | --- | --- | --- |
Magnesium (Mg) | --- | 2,000 | --- |
Sodium (Na) | --- | 2,000 | See SAR |
Potassium (K) | --- | --- | --- |
Iron (Fe) | 0.3 [a][s] | --- | --- |
Manganese (Mn) | 0.05 [a][s] | --- | 2.0 |
Silica (SiO2) | --- | --- | --- |
Bicarbonate (HCO3) | --- | --- | --- |
Carbonate (CO3) | --- | --- | --- |
Chloride (Cl) | 250 [a][s] | 1,500 | --- |
Sulfate (SO4) | 250 [a][s] | 1,500 | [b] |
Nitrate (NO3 as N) | 10 [p] | 100 | --- |
Fluoride (F) | 4 [p] | 2 | --- |
Phosphate (as P) | --- | --- | --- |
Total dissolved solids | 500 [a][s] | 5,000 | 2,000 [c] |
Specific conductance | --- | --- | 2,500 [c] |
pH | 6.5 - 8.5 [a][s] | --- | 4.5 - 9.0 |
Total hardness | --- | --- | --- |
Total alkalinity | --- | --- | --- |
Sodium Adsorption Ratio | --- | --- | 8-18[d] |
Trace metals | |||
Trace Metal | Drinking water limits (ug/L) | Stock water limits (ug/L) | Irrigation water limits (ug/L) |
Aluminum (Al) | 50-200 [a][s] | --- | 1,000 |
Antimony (Sb) | 6 [p] | --- | --- |
Arsenic (As) | 10 [p] | 50 | 100 |
Barium (Ba) | 2,000 [p] | --- | --- |
Boron (B) | --- | --- | See Boron |
Bromide (Br) | --- | --- | --- |
Cadmium (Cd) | 5 [p] | 10 | 5 |
Chromium (Cr) | 100 [p] | 1,000 | 100 |
Cobalt (Co) | --- | 1,000 | 50 |
Copper (Cu) | 1,300 [p] | 500 | 200 |
Lead (Pb) | 15 [p] | 50 | 5,000 |
Lithium (Li) | --- | --- | 2,500 |
Molybdenum (Mo) | --- | --- | 5 |
Nickel (Ni) | --- | --- | 200 |
Phosphate (P) | --- | --- | --- |
Selenium (Se) | 50 [p] | 50 | 20 |
Silver (Ag) | 100 [a][s] | --- | --- |
Strontium (Sr) | --- | --- | --- |
Titanium (Ti) | --- | --- | --- |
Uranium (U) | 30 [p] | --- | --- |
Vanadium (V) | --- | --- | --- |
Zinc (Zn) | 5,000 [a][s] | 24,000 | 2,000 |
Zirconium (Zr) | --- | --- | --- |
Footnotes:
--- | There is currently no standard for this constituent. |
[a] | This standard is based on aesthetic quality of water (i.e. odor, color, etc.) and is not a health standard. |
[b] | High concentrations of sulfate may restrict calcium uptake by crops. |
[c] | Varies with crop; generally dissolved solids should be less than 2,000 mg/L (equivalent to specific conductance of about 2000 to 3000 micromhos/cm). |
[d] | Dependent upon other variables such as type of clay in soil and salt content of water. (See SAR) |
[p] | U.S. Environmental Protection Agency maximum contaminant level or action level: revised October 13, 1999. |
[s] | U.S. Environmental Protection Agency secondary contaminant level: revised October 13, 1999. |
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