Non-Transient Non-Community · PWSID IL3113985

Riverdale School District #100

Serves 1,340 peopleGroundwaterOwner: Public/PrivatePort Byron, IllinoisServes a school or daycare
Nothing open that measures the water, but 20 open testing or paperwork violations.

A missed test is not evidence of bad water. It also is not evidence of good water: for that period nobody checked.

On record since 2000: 106 violations. 3 treatment lapses · 79 missed or late tests · 24 notices or reports. Most recent began 2025-09-01.

None of them is a measurement of contaminated water.

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

0Over the limit
3Treatment lapse
79Missed or late test
24Notice or report20 open

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

The record, year by year

2000 · Missed or late test: 1200020052006 · Missed or late test: 12009 · Missed or late test: 1201020152017 · Missed or late test: 12018 · Missed or late test: 22019 · Missed or late test: 12020 · Missed or late test: 332020 · Missed or late test: 332020 · Missed or late test: 332020 · Missed or late test: 332020 · Missed or late test: 332020 · Missed or late test: 332020 · Missed or late test: 332020 · Missed or late test: 332020 · Missed or late test: 3320202022 · Missed or late test: 42023 · Treatment lapse: 12023 · Missed or late test: 22023 · Notice or report: 52023 · Notice or report: 52024 · Treatment lapse: 22024 · Missed or late test: 292024 · Missed or late test: 292024 · Missed or late test: 292024 · Missed or late test: 292024 · Missed or late test: 292024 · Missed or late test: 292024 · Missed or late test: 292024 · Missed or late test: 292024 · Notice or report: 152024 · Notice or report: 152024 · Notice or report: 152024 · Notice or report: 152025 · Missed or late test: 42025 · Notice or report: 42025
One square ≈ 4 violations (rounded up), by the year they began. Empty columns are years with nothing on EPA's record.
3% treatment lapse · 375% missed or late test · 7923% notice or report · 24

Across Illinois, 81% of violations are missed or late tests and 3% are water over a limit.

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 3 results on file · action level 15 ppb

13 ppb
0 ppb
0 ppb

Open now (20)

  1. 2025-06-06Public NoticePN Violation for NPDWR ViolationOpen
  2. 2025-03-23Public NoticePN Violation for NPDWR ViolationOpen
  3. 2024-12-21Public NoticePN Violation for NPDWR ViolationOpen
  4. 2024-12-04Public NoticePN Violation for NPDWR ViolationOpen
  5. 2024-11-01Public NoticePN Violation for NPDWR ViolationOpen
  6. 2024-05-23Public NoticePN Violation for NPDWR ViolationOpen
  7. 2024-05-22Public NoticePN Violation for NPDWR ViolationOpen
  8. 2024-02-15Public Notice ×8PN Violation for NPDWR ViolationOpen
  9. 2024-01-24Public NoticePN Violation for NPDWR ViolationOpen
  10. 2023-11-01Revised Total Coliform RuleRPTOpen
  11. 2023-09-01Revised Total Coliform RuleRPTOpen
  12. 2023-06-25Public NoticePN Violation for NPDWR ViolationOpen
  13. 2023-06-24Public NoticePN Violation for NPDWR ViolationOpen

Every violation on record

  1. 2025-09-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  2. 2025-09-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  3. 2025-08-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  4. 2025-08-01Revised Total Coliform RuleMONBack in compliance
  5. 2025-06-07Public NoticePN Violation for NPDWR ViolationBack in compliance
  6. 2025-06-06Public NoticePN Violation for NPDWR ViolationOpen
  7. 2025-04-05Public NoticePN Violation for NPDWR ViolationBack in compliance
  8. 2025-03-23Public NoticePN Violation for NPDWR ViolationOpen
  9. 2024-12-21Public NoticePN Violation for NPDWR ViolationOpen
  10. 2024-12-04Public NoticePN Violation for NPDWR ViolationOpen
  11. 2024-11-01Public NoticePN Violation for NPDWR ViolationOpen
  12. 2024-10-27Revised Total Coliform RuleTTBack in compliance
  13. 2024-10-17Lead service line inventoryTTBack in compliance
  14. 2024-10-17Lead service line inventoryRPTBack in compliance
  15. 2024-10-12E. ColiMonitoring, Source Water (GWR)Back in compliance
  16. 2024-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  17. 2024-05-23Public NoticePN Violation for NPDWR ViolationOpen
  18. 2024-05-22Public NoticePN Violation for NPDWR ViolationOpen
  19. 2024-04-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  20. 2024-04-01Revised Total Coliform RuleMONBack in compliance
  21. 2024-02-15Public Notice ×8PN Violation for NPDWR ViolationOpen
  22. 2024-01-24Public NoticePN Violation for NPDWR ViolationOpen
  23. 2024-01-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  24. 2024-01-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  25. 2024-01-01ArsenicMonitoring, RegularPeriod ended · no return to compliance on file
Show the other 74 entries
  1. 2024-01-01StyreneMonitoring, RegularPeriod ended · no return to compliance on file
  2. 2024-01-01EthylbenzeneMonitoring, RegularPeriod ended · no return to compliance on file
  3. 2024-01-01TolueneMonitoring, RegularPeriod ended · no return to compliance on file
  4. 2024-01-01BenzeneMonitoring, RegularPeriod ended · no return to compliance on file
  5. 2024-01-01ChlorobenzeneMonitoring, RegularPeriod ended · no return to compliance on file
  6. 2024-01-01TetrachloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file
  7. 2024-01-011,1,2-TrichloroethaneMonitoring, RegularPeriod ended · no return to compliance on file
  8. 2024-01-01TrichloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file
  9. 2024-01-011,2-DichloropropaneMonitoring, RegularPeriod ended · no return to compliance on file
  10. 2024-01-01Carbon tetrachlorideMonitoring, RegularPeriod ended · no return to compliance on file
  11. 2024-01-011,1,1-TrichloroethaneMonitoring, RegularPeriod ended · no return to compliance on file
  12. 2024-01-011,2-DichloroethaneMonitoring, RegularPeriod ended · no return to compliance on file
  13. 2024-01-01trans-1,2-DichloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file
  14. 2024-01-011,1-DichloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file
  15. 2024-01-01Vinyl chlorideMonitoring, RegularPeriod ended · no return to compliance on file
  16. 2024-01-01p-DichlorobenzeneMonitoring, RegularPeriod ended · no return to compliance on file
  17. 2024-01-01o-DichlorobenzeneMonitoring, RegularPeriod ended · no return to compliance on file
  18. 2024-01-01DichloromethaneMonitoring, RegularPeriod ended · no return to compliance on file
  19. 2024-01-01Xylenes, TotalMonitoring, RegularPeriod ended · no return to compliance on file
  20. 2024-01-01cis-1,2-DichloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file
  21. 2024-01-011,2,4-TrichlorobenzeneMonitoring, RegularPeriod ended · no return to compliance on file
  22. 2024-01-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  23. 2023-12-01Revised Total Coliform RuleTTBack in compliance
  24. 2023-11-01Revised Total Coliform RuleRPTOpen
  25. 2023-10-01Revised Total Coliform RuleRPTBack in compliance
  26. 2023-09-01Revised Total Coliform RuleRPTOpen
  27. 2023-06-25Public NoticePN Violation for NPDWR ViolationOpen
  28. 2023-06-24Public NoticePN Violation for NPDWR ViolationOpen
  29. 2023-04-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  30. 2023-04-01Revised Total Coliform RuleMONBack in compliance
  31. 2022-10-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  32. 2022-05-01Revised Total Coliform RuleMONBack in compliance
  33. 2022-04-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  34. 2022-01-01ArsenicMonitoring, RegularBack in compliance
  35. 2020-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  36. 2020-01-01Beryllium, TotalMonitoring, RegularBack in compliance
  37. 2020-01-01BariumMonitoring, RegularBack in compliance
  38. 2020-01-01Antimony, TotalMonitoring, RegularPeriod ended · no return to compliance on file
  39. 2020-01-01SeleniumMonitoring, RegularBack in compliance
  40. 2020-01-01ChromiumMonitoring, RegularBack in compliance
  41. 2020-01-01Thallium, TotalMonitoring, RegularBack in compliance
  42. 2020-01-01CadmiumMonitoring, RegularBack in compliance
  43. 2020-01-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  44. 2020-01-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  45. 2020-01-01NitrateMonitoring, RegularBack in compliance
  46. 2020-01-01ArsenicMonitoring, RegularBack in compliance
  47. 2020-01-01StyreneMonitoring, RegularBack in compliance
  48. 2020-01-01EthylbenzeneMonitoring, RegularBack in compliance
  49. 2020-01-01TolueneMonitoring, RegularBack in compliance
  50. 2020-01-01BenzeneMonitoring, RegularBack in compliance
  51. 2020-01-01ChlorobenzeneMonitoring, RegularBack in compliance
  52. 2020-01-01TetrachloroethyleneMonitoring, RegularBack in compliance
  53. 2020-01-011,1,2-TrichloroethaneMonitoring, RegularBack in compliance
  54. 2020-01-01TrichloroethyleneMonitoring, RegularBack in compliance
  55. 2020-01-011,2-DichloropropaneMonitoring, RegularBack in compliance
  56. 2020-01-01Carbon tetrachlorideMonitoring, RegularBack in compliance
  57. 2020-01-011,1,1-TrichloroethaneMonitoring, RegularBack in compliance
  58. 2020-01-011,2-DichloroethaneMonitoring, RegularBack in compliance
  59. 2020-01-01trans-1,2-DichloroethyleneMonitoring, RegularBack in compliance
  60. 2020-01-011,1-DichloroethyleneMonitoring, RegularBack in compliance
  61. 2020-01-01Vinyl chlorideMonitoring, RegularBack in compliance
  62. 2020-01-01p-DichlorobenzeneMonitoring, RegularBack in compliance
  63. 2020-01-01o-DichlorobenzeneMonitoring, RegularBack in compliance
  64. 2020-01-01DichloromethaneMonitoring, RegularBack in compliance
  65. 2020-01-01Xylenes, TotalMonitoring, RegularBack in compliance
  66. 2020-01-01cis-1,2-DichloroethyleneMonitoring, RegularBack in compliance
  67. 2020-01-011,2,4-TrichlorobenzeneMonitoring, RegularBack in compliance
  68. 2019-01-01NitrateMonitoring, RegularBack in compliance
  69. 2018-01-01NitrateMonitoring, RegularBack in compliance
  70. 2018-01-01ArsenicMonitoring, RegularBack in compliance
  71. 2017-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  72. 2009-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  73. 2006-07-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  74. 2000-07-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance

System details

Population served1,340
Service connections5
Water sourceGroundwater
System typeNon-Transient Non-Community
OwnerPublic/Private
StatusActive
CityPort Byron
EPA ZIP on file61275

Areas served

  • Rock Island County

Reading this record

Riverdale School District #100 is a non-transient non-community that draws from groundwater and serves about 1,340 people in Port Byron, Illinois. 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.