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How much disinfection byproduct is in the water?

When chlorine meets the organic matter in river and reservoir water it forms trihalomethanes and haloacetic acids, the most common contaminants actually measured in Ohio tap water. EPA's Six-Year Review file holds every compliance sample from 2012 through 2019; the map shows the latest yearly mean of total trihalomethanes for the system serving each ZIP against the 80 µg/L annual-average limit, and the card adds haloacetic acids (limit 60), the highest nitrate, arsenic, radium, gross alpha and uranium results, and how many samples sit behind each number. Well systems usually run low; big surface-water systems sit closer to the line, especially in late summer.

671 of 1,233 ZIPs have data; median 35.4 µg/L.

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Under 20 µg/L TTHM · 110 20 to 40 · 316 40 to 60 · 211 60 to 80 · 30 80 or more · 4 No data · 562

Highest and lowest

Highest

  1. 43502 · Archbold113.7 µg/L
  2. 43791 · Newton Township and White Cottage82.1 µg/L
  3. 43738 · Fultonham82.1 µg/L
  4. 43735 · Newton Township and East Fultonham82.1 µg/L
  5. 43115 · Deerfield Township and Clarksburg77.8 µg/L
  6. 43543 · Montpelier75.8 µg/L
  7. 44613 · Brewster71.8 µg/L
  8. 43512 · Defiance70.9 µg/L
  9. 43465 · Walbridge70.3 µg/L
  10. 43463 · Troy Township and Stony Ridge70.3 µg/L
  11. 43443 · Luckey70.3 µg/L
  12. 45828 · Coldwater69.6 µg/L
  13. 44485 · Warren69 µg/L
  14. 44484 · Howland Township and Warren69 µg/L
  15. 44483 · Warren69 µg/L

Lowest

  1. 43050 · Mount Vernon0 µg/L
  2. 43151 · Midway and Sedalia0 µg/L
  3. 43906 · Bellaire0 µg/L
  4. 43931 · Ohio Township and Hannibal0 µg/L
  5. 43962 · Summitville0 µg/L
  6. 44610 · Berlin Township and Berlin0 µg/L
  7. 44653 · Midvale0 µg/L
  8. 44659 · Mount Eaton0 µg/L
  9. 44661 · Nashville0 µg/L
  10. 44689 · Paint Township and Wilmot0 µg/L
  11. 44838 · Hayesville0 µg/L
  12. 45013 · Hamilton0 µg/L
  13. 45015 · Hamilton0 µg/L
  14. 45307 · Bowersville0 µg/L
  15. 45336 · Kettlersville0 µg/L

Source

EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019: total trihalomethanes and haloacetic acids (HAA5) sampled in the distribution system, nitrate, arsenic, combined radium, gross alpha and uranium at entry points; yearly means by system, non-detects as zero; benzene, carbon tetrachloride, 1,2-dichloroethane, trichloroethylene, tetrachloroethylene and vinyl chloride from the same files; atrazine, alachlor, 2,4-D, chromium, cadmium, barium, mercury, selenium and thallium likewise; total coliform and E. coli distribution samples from the same review (presence or absence)

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Quick answers

Which Ohio ZIP code has the highest disinfection byproduct level?

ZIP code 43502 (Archbold, 113.7 µg/L) ranks highest, followed by 43791 (Newton Township and White Cottage, 82.1 µg/L) and 43738 (Fultonham, 82.1 µg/L). When chlorine meets the organic matter in river and reservoir water it forms trihalomethanes and haloacetic acids, the most common contaminants actually measured in Ohio tap water.

Which Ohio ZIP code has the lowest disinfection byproduct level?

ZIP code 43050 (Mount Vernon, 0 µg/L) ranks lowest, followed by 43151 (Midway and Sedalia, 0 µg/L) and 43906 (Bellaire, 0 µg/L). When chlorine meets the organic matter in river and reservoir water it forms trihalomethanes and haloacetic acids, the most common contaminants actually measured in Ohio tap water.

What is the typical disinfection byproduct level in Ohio?

Across Ohio ZIP codes: 671 of 1,233 ZIPs have data; median 35.4 µg/L. When chlorine meets the organic matter in river and reservoir water it forms trihalomethanes and haloacetic acids, the most common contaminants actually measured in Ohio tap water.

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Cracked Buckeye, "Disinfection byproducts", https://crackedbuckeye.com/topics/dbp/, built 2026-10-31, accessed [date].

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