Community Water System · PWSID NY0602924

Chautauqua Water District #2

Serves 490 peopleSurface WaterOwner: PrivateMayville, New York
Nothing open right now.

On record since 2016: 148 violations. 16 over the limit · 13 treatment lapses · 118 missed or late tests · 1 notice or report. Most recent began 2024-10-17.

For this year's test results, ask the utility for its annual Consumer Confidence Report. Every community system must publish one.

16Over the limit
13Treatment lapse
118Missed or late test
1Notice or report

More violations on record than 98% of active water systems in New York. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

2005201020152016 · Missed or late test: 32017 · Over the limit: 12017 · Missed or late test: 12018 · Over the limit: 52018 · Treatment lapse: 122018 · Treatment lapse: 122019 · Over the limit: 82019 · Over the limit: 82020 · Treatment lapse: 120202021 · Missed or late test: 762021 · Missed or late test: 762021 · Missed or late test: 762021 · Missed or late test: 762021 · Missed or late test: 762021 · Missed or late test: 762021 · Missed or late test: 762021 · Missed or late test: 762021 · Missed or late test: 762021 · Missed or late test: 762021 · Missed or late test: 762023 · Missed or late test: 382023 · Missed or late test: 382023 · Missed or late test: 382023 · Missed or late test: 382023 · Missed or late test: 382023 · Missed or late test: 382024 · Over the limit: 22024 · Notice or report: 12025
One square ≈ 7 violations (rounded up), by the year they began. Empty columns are years with nothing on EPA's record.
11% over the limit · 169% treatment lapse · 1380% missed or late test · 118<1% notice or report · 1

Across New York, 67% of violations are missed or late tests and 3% are water over a limit.

How far over the limit

at the limit2×5×10×100×+Trihalomethanes (TTHM)Total Haloacetic Acids (HAA5)2024-07-01 · Trihalomethanes (TTHM): measured 88.86 UG/L vs limit 80.00 UG/L (1.1×)2024-04-01 · Trihalomethanes (TTHM): measured 84.76 UG/L vs limit 80.00 UG/L (1.1×)2019-10-01 · Trihalomethanes (TTHM): measured 80.56 UG/L vs limit 80.00 UG/L (1.0×)2019-10-01 · Total Haloacetic Acids (HAA5): measured 70.30 UG/L vs limit 60.00 UG/L (1.2×)2019-04-01 · Trihalomethanes (TTHM): measured 81.86 UG/L vs limit 80.00 UG/L (1.0×)2019-04-01 · Total Haloacetic Acids (HAA5): measured 73.25 UG/L vs limit 60.00 UG/L (1.2×)2019-01-01 · Total Haloacetic Acids (HAA5): measured 88.60 UG/L vs limit 60.00 UG/L (1.5×)2018-10-01 · Total Haloacetic Acids (HAA5): measured 86.00 UG/L vs limit 60.00 UG/L (1.4×)2018-07-01 · Total Haloacetic Acids (HAA5): measured 74.00 UG/L vs limit 60.00 UG/L (1.2×)
Each dot is one over-the-limit violation: the measured value divided by the limit it broke, on a log scale. Most legal limits for chemicals are running averages set for a lifetime of drinking, so “just over” and “ten times over” are very different news. Hover a dot for the numbers.

Lead & copper at the tap

Utilities sample taps in homes most likely to have lead pipes, and report the 90th-percentile result: 9 in 10 homes sampled came in at or below this number. Above the red line (the action level) the utility must act. The action level is not a safe level; EPA's health goal for lead is zero. EPA's file does not date these results, so they are shown highest first.

Lead, 90th percentile 6 results on file · action level 15 ppb

8 ppb
5.3 ppb
1.7 ppb
1 ppb
0 ppb
0 ppb

Every violation on record

  1. 2024-10-17Lead service line inventoryRPTBack in compliance
  2. 2024-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 88.86 UG/L · limit 80.00 UG/LPeriod ended · no return to compliance on file
  3. 2024-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 84.76 UG/L · limit 80.00 UG/LPeriod ended · no return to compliance on file
  4. 2023-01-01ChlordaneMonitoring, RegularBack in compliance
  5. 2023-01-01Ethylene DibromideMonitoring, RegularBack in compliance
  6. 2023-01-01MetribuzinMonitoring, RegularBack in compliance
  7. 2023-01-01DicambaMonitoring, RegularBack in compliance
  8. 2023-01-01Total Polychlorinated Biphenyls (PCB)Monitoring, RegularBack in compliance
  9. 2023-01-01AldrinMonitoring, RegularBack in compliance
  10. 2023-01-01PentachlorophenolMonitoring, RegularBack in compliance
  11. 2023-01-01Benzo(a)pyreneMonitoring, RegularBack in compliance
  12. 2023-01-01HexachlorobenzeneMonitoring, RegularBack in compliance
  13. 2023-01-012, 4, 5-TpMonitoring, RegularBack in compliance
  14. 2023-01-012, 4-DMonitoring, RegularBack in compliance
  15. 2023-01-01PropachlorMonitoring, RegularBack in compliance
  16. 2023-01-01ButachlorMonitoring, RegularBack in compliance
  17. 2023-01-01DieldrinMonitoring, RegularBack in compliance
  18. 2023-01-01Heptachlor epoxideMonitoring, RegularBack in compliance
  19. 2023-01-013-HydroxycarbofuranMonitoring, RegularBack in compliance
  20. 2023-01-01HeptachlorMonitoring, RegularBack in compliance
  21. 2023-01-01LassoMonitoring, RegularBack in compliance
  22. 2023-01-01AtrazineMonitoring, RegularBack in compliance
  23. 2023-01-01AldicarbMonitoring, RegularBack in compliance
  24. 2023-01-01CarbofuranMonitoring, RegularBack in compliance
  25. 2023-01-01MetolachlorMonitoring, RegularBack in compliance
Show the other 123 entries
  1. 2023-01-01Aldicarb sulfoneMonitoring, RegularBack in compliance
  2. 2023-01-01Aldicarb sulfoxideMonitoring, RegularBack in compliance
  3. 2023-01-01HexachlorocyclopentadieneMonitoring, RegularBack in compliance
  4. 2023-01-01DinosebMonitoring, RegularBack in compliance
  5. 2023-01-01PicloramMonitoring, RegularBack in compliance
  6. 2023-01-01Di(2-ethylhexyl) phthalateMonitoring, RegularBack in compliance
  7. 2023-01-01SimazineMonitoring, RegularBack in compliance
  8. 2023-01-01OxamylMonitoring, RegularBack in compliance
  9. 2023-01-01Di(2-ethylhexyl) adipateMonitoring, RegularBack in compliance
  10. 2023-01-01DalaponMonitoring, RegularBack in compliance
  11. 2023-01-01MethomylMonitoring, RegularBack in compliance
  12. 2023-01-01CarbarylMonitoring, RegularBack in compliance
  13. 2023-01-01ToxapheneMonitoring, RegularBack in compliance
  14. 2023-01-01MethoxychlorMonitoring, RegularBack in compliance
  15. 2023-01-01Bhc-GammaMonitoring, RegularBack in compliance
  16. 2023-01-01EndrinMonitoring, RegularBack in compliance
  17. 2021-10-01LassoMonitoring, RegularPeriod ended · no return to compliance on file
  18. 2021-10-01AtrazineMonitoring, RegularPeriod ended · no return to compliance on file
  19. 2021-10-01AldicarbMonitoring, RegularPeriod ended · no return to compliance on file
  20. 2021-10-01CarbofuranMonitoring, RegularPeriod ended · no return to compliance on file
  21. 2021-10-01MetolachlorMonitoring, RegularPeriod ended · no return to compliance on file
  22. 2021-10-01Aldicarb sulfoneMonitoring, RegularPeriod ended · no return to compliance on file
  23. 2021-10-01Aldicarb sulfoxideMonitoring, RegularPeriod ended · no return to compliance on file
  24. 2021-10-01HexachlorocyclopentadieneMonitoring, RegularPeriod ended · no return to compliance on file
  25. 2021-10-01DinosebMonitoring, RegularPeriod ended · no return to compliance on file
  26. 2021-10-01PicloramMonitoring, RegularPeriod ended · no return to compliance on file
  27. 2021-10-01Di(2-ethylhexyl) phthalateMonitoring, RegularPeriod ended · no return to compliance on file
  28. 2021-10-01SimazineMonitoring, RegularPeriod ended · no return to compliance on file
  29. 2021-10-01OxamylMonitoring, RegularPeriod ended · no return to compliance on file
  30. 2021-10-01Di(2-ethylhexyl) adipateMonitoring, RegularPeriod ended · no return to compliance on file
  31. 2021-10-01DalaponMonitoring, RegularPeriod ended · no return to compliance on file
  32. 2021-10-01MethomylMonitoring, RegularPeriod ended · no return to compliance on file
  33. 2021-10-01CarbarylMonitoring, RegularPeriod ended · no return to compliance on file
  34. 2021-10-01ToxapheneMonitoring, RegularPeriod ended · no return to compliance on file
  35. 2021-10-01MethoxychlorMonitoring, RegularPeriod ended · no return to compliance on file
  36. 2021-10-01Bhc-GammaMonitoring, RegularPeriod ended · no return to compliance on file
  37. 2021-10-01EndrinMonitoring, RegularPeriod ended · no return to compliance on file
  38. 2021-10-01ChlordaneMonitoring, RegularPeriod ended · no return to compliance on file
  39. 2021-10-01Ethylene DibromideMonitoring, RegularPeriod ended · no return to compliance on file
  40. 2021-10-01MetribuzinMonitoring, RegularPeriod ended · no return to compliance on file
  41. 2021-10-01DicambaMonitoring, RegularPeriod ended · no return to compliance on file
  42. 2021-10-01Total Polychlorinated Biphenyls (PCB)Monitoring, RegularPeriod ended · no return to compliance on file
  43. 2021-10-01AldrinMonitoring, RegularPeriod ended · no return to compliance on file
  44. 2021-10-01PentachlorophenolMonitoring, RegularPeriod ended · no return to compliance on file
  45. 2021-10-01Benzo(a)pyreneMonitoring, RegularPeriod ended · no return to compliance on file
  46. 2021-10-01HexachlorobenzeneMonitoring, RegularPeriod ended · no return to compliance on file
  47. 2021-10-012, 4, 5-TpMonitoring, RegularPeriod ended · no return to compliance on file
  48. 2021-10-012, 4-DMonitoring, RegularPeriod ended · no return to compliance on file
  49. 2021-10-01PropachlorMonitoring, RegularPeriod ended · no return to compliance on file
  50. 2021-10-01ButachlorMonitoring, RegularPeriod ended · no return to compliance on file
  51. 2021-10-01DieldrinMonitoring, RegularPeriod ended · no return to compliance on file
  52. 2021-10-01Heptachlor epoxideMonitoring, RegularPeriod ended · no return to compliance on file
  53. 2021-10-013-HydroxycarbofuranMonitoring, RegularPeriod ended · no return to compliance on file
  54. 2021-10-01HeptachlorMonitoring, RegularPeriod ended · no return to compliance on file
  55. 2021-07-01ChlordaneMonitoring, RegularPeriod ended · no return to compliance on file
  56. 2021-07-01Ethylene DibromideMonitoring, RegularPeriod ended · no return to compliance on file
  57. 2021-07-01MetribuzinMonitoring, RegularPeriod ended · no return to compliance on file
  58. 2021-07-01DicambaMonitoring, RegularPeriod ended · no return to compliance on file
  59. 2021-07-01Total Polychlorinated Biphenyls (PCB)Monitoring, RegularPeriod ended · no return to compliance on file
  60. 2021-07-01AldrinMonitoring, RegularPeriod ended · no return to compliance on file
  61. 2021-07-01PentachlorophenolMonitoring, RegularPeriod ended · no return to compliance on file
  62. 2021-07-01Benzo(a)pyreneMonitoring, RegularPeriod ended · no return to compliance on file
  63. 2021-07-01HexachlorobenzeneMonitoring, RegularPeriod ended · no return to compliance on file
  64. 2021-07-012, 4, 5-TpMonitoring, RegularPeriod ended · no return to compliance on file
  65. 2021-07-012, 4-DMonitoring, RegularPeriod ended · no return to compliance on file
  66. 2021-07-01PropachlorMonitoring, RegularPeriod ended · no return to compliance on file
  67. 2021-07-01ButachlorMonitoring, RegularPeriod ended · no return to compliance on file
  68. 2021-07-01DieldrinMonitoring, RegularPeriod ended · no return to compliance on file
  69. 2021-07-01Heptachlor epoxideMonitoring, RegularPeriod ended · no return to compliance on file
  70. 2021-07-013-HydroxycarbofuranMonitoring, RegularPeriod ended · no return to compliance on file
  71. 2021-07-01HeptachlorMonitoring, RegularPeriod ended · no return to compliance on file
  72. 2021-07-01LassoMonitoring, RegularPeriod ended · no return to compliance on file
  73. 2021-07-01AtrazineMonitoring, RegularPeriod ended · no return to compliance on file
  74. 2021-07-01AldicarbMonitoring, RegularPeriod ended · no return to compliance on file
  75. 2021-07-01CarbofuranMonitoring, RegularPeriod ended · no return to compliance on file
  76. 2021-07-01MetolachlorMonitoring, RegularPeriod ended · no return to compliance on file
  77. 2021-07-01Aldicarb sulfoneMonitoring, RegularPeriod ended · no return to compliance on file
  78. 2021-07-01Aldicarb sulfoxideMonitoring, RegularPeriod ended · no return to compliance on file
  79. 2021-07-01HexachlorocyclopentadieneMonitoring, RegularPeriod ended · no return to compliance on file
  80. 2021-07-01DinosebMonitoring, RegularPeriod ended · no return to compliance on file
  81. 2021-07-01PicloramMonitoring, RegularPeriod ended · no return to compliance on file
  82. 2021-07-01Di(2-ethylhexyl) phthalateMonitoring, RegularPeriod ended · no return to compliance on file
  83. 2021-07-01SimazineMonitoring, RegularPeriod ended · no return to compliance on file
  84. 2021-07-01OxamylMonitoring, RegularPeriod ended · no return to compliance on file
  85. 2021-07-01Di(2-ethylhexyl) adipateMonitoring, RegularPeriod ended · no return to compliance on file
  86. 2021-07-01DalaponMonitoring, RegularPeriod ended · no return to compliance on file
  87. 2021-07-01MethomylMonitoring, RegularPeriod ended · no return to compliance on file
  88. 2021-07-01CarbarylMonitoring, RegularPeriod ended · no return to compliance on file
  89. 2021-07-01ToxapheneMonitoring, RegularPeriod ended · no return to compliance on file
  90. 2021-07-01MethoxychlorMonitoring, RegularPeriod ended · no return to compliance on file
  91. 2021-07-01Bhc-GammaMonitoring, RegularPeriod ended · no return to compliance on file
  92. 2021-07-01EndrinMonitoring, RegularPeriod ended · no return to compliance on file
  93. 2020-01-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  94. 2019-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 80.56 UG/L · limit 80.00 UG/LPeriod ended · no return to compliance on file
  95. 2019-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 70.30 UG/L · limit 60.00 UG/LPeriod ended · no return to compliance on file
  96. 2019-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 80.05 UG/LBack in compliance
  97. 2019-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 81.93 UG/LBack in compliance
  98. 2019-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 81.86 UG/L · limit 80.00 UG/LBack in compliance
  99. 2019-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 73.25 UG/L · limit 60.00 UG/LBack in compliance
  100. 2019-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 85.21 UG/LBack in compliance
  101. 2019-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 88.60 UG/L · limit 60.00 UG/LBack in compliance
  102. 2018-12-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  103. 2018-11-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  104. 2018-10-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  105. 2018-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 86.00 UG/L · limit 60.00 UG/LBack in compliance
  106. 2018-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 76.28 UG/LBack in compliance
  107. 2018-09-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  108. 2018-08-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  109. 2018-07-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  110. 2018-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 74.00 UG/L · limit 60.00 UG/LBack in compliance
  111. 2018-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 82.47 UG/LBack in compliance
  112. 2018-06-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  113. 2018-05-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  114. 2018-04-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  115. 2018-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 122.90 UG/LBack in compliance
  116. 2018-03-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  117. 2018-02-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  118. 2018-01-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  119. 2017-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 63.48 UG/LBack in compliance
  120. 2017-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  121. 2016-04-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  122. 2016-04-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  123. 2016-01-01NitrateMonitoring, RegularBack in compliance

System details

Population served490
Service connections172
Water sourceSurface Water
System typeCommunity Water System
OwnerPrivate
StatusActive
CityMayville
EPA ZIP on file14757

Areas served

  • Chautauqua County

Reading this record

Chautauqua Water District #2 is a community water system that draws from surface water and serves about 490 people in Mayville, New York. Everything above comes from the EPA's Safe Drinking Water Information System (SDWIS), where states report every violation by every public water system.

Four kinds of violation. Only one is a measurement of the water: over the limit means a test came back above a legal maximum (an MCL). A treatment lapse means a required protective step was not done, such as disinfection, filtration, fixing a defect an inspector found, or filing a lead-pipe inventory. A missed or late test means a required test was skipped or never reported. That is the most common kind, and the most misread: it does not mean the water was bad, and it does not mean the water was fine. Notices and reports covers public notices and the annual Consumer Confidence Report.

Status. “Back in compliance” means the state recorded a return to compliance. “Period ended” means the violation's compliance period is over but no return to compliance was ever filed, which is common in older records. EPA's federal copy lags state records by months, so call the utility for anything current.