Bacteria Data Summary

Draft 2006 303(d) list

Water Quality Standards Workgroup -- June 26, 2007

TCEQ Staff DRAFT

Intermittent Streams

  • 30 water bodies listed (31 AUs).
  • 24 AU_ID listings for both single samples (SS) & geometric means (GM) nonsupport.
  • 3 AU_ID listings based on SS nonsupport (carryforwards (CF) from previous assessments).
  • 4 AU_ID listings based on GM nonsupport.
  • Geometric means ranged from 133.8 to 4645 (E. coli).
  • Single sample means ranged from 771 to 26,042 (E. coli).
  • Geometric means ranged from 286 to 1450 (F. coliform).
  • Single sample means ranged from 989 to 5794 (F. coliform).
  • 3 water bodies listed meet EPA’s primary contact recreation geometric mean of 206 per 100 ml E. coli (10 illnesses per 1000 swimmers).
  • 20 water bodies listed have geometric means less than or equal to 630 per 100 ml E. coli or 1000 per 100 ml fecal coliform (potential secondary recreation criteria discussed at May 16, 2007 standards workgroup).

Intermittent Streams with perennial pools

  • 44 water bodies listed (48 AUs).
  • 28 AU_ID listings for both SS & GM nonsupport.
  • 19 AU_ID listings based on GM nonsupport.
  • 1 AU_ID listing based on SS nonsupport.
  • Single sample numbers ranged from 763 to 6514 (E. coli).
  • Geometric means ranged from 131 to 1053 (E. coli).
  • Single sample numbers ranged from 811 to 5883 (F. coliform).
  • Geometric means ranged from 236 to 842 (F. coliform).
  • EN single sample 467 & geometric mean 105
  • 12AU_IDs (11 water bodies) listed meet EPA’s primary contact recreation geometric mean of 206 per 100 ml E. coli.
  • 38 AU_IDs listed (35water bodies) have geometric means less than or equal to 630 per 100 ml E. coli or 1000 per 100 ml fecal coliform.

Perennial

  • 180 water bodies listed (266 AUs).
  • 142 AU_ID listings for both SS & GM nonsupport.
  • 111 AU_ID listings based on GM nonsupport.
  • 12 AU_ID listings based on SS nonsupport.
  • Geometric means ranged from 63 to 14563 (E. coli).
  • Single sample numbers ranged from 420 to 108483 (E. coli).
  • Geometric means ranged from 121 to 36134 (F. coliform).
  • Single sample numbers ranged from 465 to 65455 (F. coliform).
  • 80 AU_IDs (49 water bodies) listed meet EPA’s primary contact recreation geometric mean of 206 per 100 ml E. coli.
  • 112 AU_IDs listed (78 water bodies) have geometric means less than or equal to 630 per 100 ml E. coli or 1000 per 100 ml fecal coliform.

Tidal Streams

  • 27 water bodies listed (44 AUs).
  • 30 AU_ID listings for both SS & GM nonsupport.
  • 12 AU_ID listings based on GM nonsupport.
  • 2 AU_ID listings based on SS nonsupport.
  • Single sample numbers ranged from19,789 to 65,455.
  • Geometric means ranged from 35 to 36,134.
  • Geometric means ranged from 35 to 470 (Enterococcus).
  • Single sample numbers ranged from 238 to 65455 (Enterococcus).
  • Geometric means ranged from 160 to 36134 (F. coliform).
  • Single sample numbers ranged from 1151 to 65455 (F. coliform).

Reservoirs

  • 4 waterbodies (10 AUs)
  • 8 AU_ID listings based on GM nonsupport.
  • 2 AU_ID listings for both SS & GM nonsupport.
  • 2 AU_IDs (2 water bodies) listed meet EPA’s primary contact recreation geometric mean of 206 per 100 ml E. coli.
  • 1 AU_ID listed (1 water bodies) has a geometric mean less than or equal to 630 per 100 ml E. coli or 1000 per 100 ml fecal coliform.
  • Geometric means ranged from 174 to 1548 per 100 ml E. coli.
  • Single samples ranged from 2420 to 3757 per 100 ml E. coli.

Estuaries & Tidal Streams

  • 8 water bodies listed (10 AUs).
  • 8 AU_IDlistings for both SS& GM nonsupport.
  • 2 AU_IDlistings based on GM nonsupport.
  • Geometric means ranged from 42.1 to 216 (Enterococcus).
  • Single sample numbers ranged from 164 to 2508 (Enterococcus).
  • Geometric means ranged from 217 to 383 (F. coliform).
  • Single sample numbers ranged from 2371 to 4467 (F. coliform).

Ocean

  • Segment 2501 listed (2 AU).
  • 2 AU_IDs listed based on Enterococcus SS means.
  • GM 26.6, SS mean 1597
  • GM 39.4, SS mean 544

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I:\STANDARD\2006-WQS\Workgroups\Workgroup III - June 26\Handouts\Bacteria\Assessment Summary.doc

June 26, 2007 Water Quality Standards Workgroup