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ΒΆ Introduction
Survey of analysis results from Texas Plains surface and groundwater samples submitted to ServiTech Laboratories during 2013 to 2022, inclusive, for analysis of Livestock Suitability. The results are grouped by National Agricultural Statistics Service (USDA-NASS) reporting districts.
ΒΆ Figure 1. Texas Plains USDA-NASS Districts
Interpretation of survey results:
- Median = 50th percentile
- Typical range = 25th and 75th percentiles
- Low - High = 5th and 95th percentiles
ΒΆ Table 1. Total dissolved solids, TDSc mg/L |
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| Texas Plains Districts | Median | Typical range | Low - High |
| Northern High Plains | 430 | 335 β 760 | 135 β 4015 |
| Southern High Plains | 1000 | 580 β 1705 | 225 β 5285 |
| Northern Low Plains | 1925 | 1695 β 3020 | 265 β 9605 |
| Southern Low Plains | 1500 | 620 β 2790 | 165 β 11000 |
| Statewide | 530 | 355 β 1560 | 145 β 5800 |
("Acceptable" = 2000 - 4000 TDS mg/L)
ΒΆ Table 2. Sulfate, SO4 mg/L |
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| Texas Plains Districts | Median | Typical range | Low - High |
| Northern High Plains | 54 | 30 β 150 | 7 β 1955 |
| Southern High Plains | 360 | 93 β 660 | 1 β 2365 |
| Northern Low Plains | 1800 | 1500 β 2100 | 15 β 4200 |
| Southern Low Plains | 330 | 75 β 1400 | 6 β 2500 |
| Statewide | 81 | 33 β 480 | 6 β 2360 |
("Acceptable" = 200 - 500 SO4 mg/L)
ΒΆ Table 3. Nitrate-nitrogen, NO3-N mg/L |
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| Texas Plains Districts | Median | Typical range | Low - High |
| Northern High Plains | 2.1 | 1.0 β 3.7 | 0.1 β 12.2 |
| Southern High Plains | 0.9 | 0.1 β 5.8 | 0.1 β 15.4 |
| Northern Low Plains | 10.0 | 1.0 β 10.0 | 0.1 β 14.5 |
| Southern Low Plains | 7.6 | 1.0 β 13.3 | 0.1 β 35.5 |
| Statewide | 2.1 | 0.7 β 5.1 | 0.1 β 15.7 |
("Acceptable" = 30 - 70 NO3-N mg/L)
ΒΆ Table 4. Calcium, Ca mg/L |
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| Texas Plains Districts | Median | Typical range | Low - High |
| Northern High Plains | 48 | 36 β 70 | 5 β 524 |
| Southern High Plains | 114 | 43 β 239 | 4 β 627 |
| Northern Low Plains | 610 | 518 β 680 | 48 β 901 |
| Southern Low Plains | 130 | 62 β 400 | 11 β 1200 |
| Statewide | 56 | 38 β 160 | 5 β 680 |
("Acceptable" = 80 - 120 Ca mg/L)
ΒΆ Table 5. Magnesium, Mg mg/L |
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| Texas Plains Districts | Median | Typical range | Low - High |
| Northern High Plains | 31 | 23 β 43 | 2 β 179 |
| Southern High Plains | 50 | 21 β 102 | 1 β 241 |
| Northern Low Plains | 140 | 97 β 180 | 9 β 441 |
| Southern Low Plains | 85 | 27 β 189 | 5 β 608 |
| Statewide | 33 | 22 β 70 | 2 β 246 |
("Acceptable" = 50 - 120 Mg mg/L)
ΒΆ Table 6. Potassium, K mg/L |
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| Texas Plains Districts | Median | Typical range | Low - High |
| Northern High Plains | 6 | 4 β 8 | 2 β 23 |
| Southern High Plains | 7 | 2 β 14 | 1 β 24 |
| Northern Low Plains | 5 | 4 β 12 | 2 β 56 |
| Southern Low Plains | 7 | 5 β 15 | 1 β 32 |
| Statewide | 6 | 4 β 9 | 1 β 33 |
("Acceptable" = 80 - 120 K mg/L)
ΒΆ Table 7. Sodium, Na mg/L |
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| Texas Plains Districts | Median | Typical range | Low - High |
| Northern High Plains | 40 | 30 β 99 | 4 β 748 |
| Southern High Plains | 100 | 37 β 241 | 13 β 1473 |
| Northern Low Plains | 78 | 40 β 427 | 3 β 3108 |
| Southern Low Plains | 195 | 87 β 394 | 5 β 1750 |
| Statewide | 48 | 31 β 174 | 5 β 1224 |
("Acceptable" = Na plus Mg less than 50% of TDS)
ΒΆ Table 8. Chloride, Cl mg/L |
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| Texas Plains Districts | Median | Typical range | Low - High |
| Northern High Plains | 35 | 15 β 93 | 4 β 1100 |
| Southern High Plains | 90 | 23 β 253 | 8 β 2560 |
| Northern Low Plains | 100 | 92 β 545 | 10 β 4100 |
| Southern Low Plains | 220 | 85 β 530 | 10 β 5100 |
| Statewide | 55 | 18 β 160 | 6 β 1600 |
("Acceptable" = 125 - 250 Cl mg/L)
ΒΆ Table 9. Electrical conductivity, EC ΞΌmho/cm |
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| Texas Plains Districts | Median | Typical range | Low - High |
| Northern High Plains | 675 | 525 β 1190 | 215 β 6280 |
| Southern High Plains | 1560 | 905 β 2670 | 350 β 8255 |
| Northern Low Plains | 3005 | 2645 β 4720 | 415 β 15005 |
| Southern Low Plains | 2350 | 970 β 4360 | 260 β 17200 |
| Statewide | 830 | 550 β 2430 | 230 β 9070 |
("Acceptable" = 1300 - 2600 ΞΌmho/cm)
ΒΆ Table 10. Iron, Fe mg/L |
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| Texas Plains Districts | Median | Typical range | Low - High |
| Northern High Plains | 0.08 | 0.05 β 0.27 | 0.05 β 2.27 |
| Southern High Plains | 0.13 | 0.06 β 0.25 | 0.05 β 2.37 |
| Northern Low Plains | 0.10 | 0.05 β 0.47 | 0.05 β 4.66 |
| Southern Low Plains | 0.17 | 0.08 β 0.61 | 0.05 β 2.89 |
| Statewide | 0.10 | 0.05 β 0.30 | 0.05 β 2.97 |
("Acceptable" = 0.20 - 0.40 Fe mg/L)
ΒΆ Table 11. Manganese, Mn mg/L |
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| Texas Plains Districts | Median | Typical range | Low - High |
| Northern High Plains | 0.005 | 0.005 β 0.023 | 0.005 β 0.368 |
| Southern High Plains | 0.005 | 0.005 β 0.021 | 0.005 β 0.197 |
| Northern Low Plains | 0.007 | 0.005 β 0.059 | 0.005 β 0.688 |
| Southern Low Plains | 0.014 | 0.005 β 0.180 | 0.005 β 0.755 |
| Statewide | 0.005 | 0.005 β 0.031 | 0.005 β 0.432 |
("Acceptable" = 0.025 - 0.050 Mn mg/L)
ΒΆ Table 12. Hardness, as CaCO3 grains/gallon |
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| Texas Plains Districts | Median | Typical range | Low - High |
| Northern High Plains | 14 | 12.0 β 20 | 1.1 β 120 |
| Southern High Plains | 31 | 11.0 β 58 | 1.1 β 147 |
| Northern Low Plains | 120 | 100 β 140 | 9.8 β 271 |
| Southern Low Plains | 42 | 17 β 110 | 4.5 β 260 |
| Statewide | 16 | 12.0 β 41 | 1.2 β 166 |
("Moderately hard" = 3.5 - 7.0 CaCO3 grains/gallon)
ΒΆ Table 13. Hardness, as CaCO3 mg/L |
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| Texas Plains Districts | Median | Typical range | Low - High |
| Northern High Plains | 250 | 200 β 350 | 20 β 2000 |
| Southern High Plains | 525 | 200 β 985 | 20 β 2465 |
| Northern Low Plains | 2100 | 1800 β 2400 | 170 β 4620 |
| Southern Low Plains | 720 | 290 β 1800 | 75 β 4500 |
| Statewide | 280 | 200 β 710 | 20 β 2800 |
("Moderately hard" = 60 to 120 CaCO3 mg/L)
ΒΆ Table 14. Water pH |
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| Texas Plains Districts | Median | Typical range | Low - High |
| Northern High Plains | 8.2 | 7.9 β 8.3 | 7.5 β 8.8 |
| Southern High Plains | 8.1 | 7.8 β 8.3 | 7.3 β 9.2 |
| Northern Low Plains | 7.9 | 7.8 β 8.1 | 7.5 β 8.9 |
| Southern Low Plains | 7.9 | 7.6 β 8.2 | 7.1 β 8.7 |
| Statewide | 8.1 | 7.9 β 8.3 | 7.4 β 8.9 |
("Neutral" pH = 6.5 - 7.5)
ΒΆ Table 15. Conversion Factors |
| 1 mg/L β 1 ppm |
| 1 mg/L = 1,000 Β΅g/L |
| 1 mmho/cm = 1 dS/m |
| 1 mmho/cm = 1,000 Β΅mho/cm lb/ac-in = mg/L x 0.2267 lb/ac-ft = mg/L x 2.7204 |
| lime equivalent, lb/ac-ft = HCO3 mg/L x 2.2304 |
| 1 acre-inch = 27,154 gallons |
| 1 acre-foot = 325,848 gallons |
ΒΆ Table 16. Sample Count |
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| Northern High Plains | 1128 |
| Southern High Plains | 146 |
| Northern Low Plains | 218 |
| Southern Low Plains | 79 |
| Statewide | 1687 |