Community Water System · PWSID IA5784326

Twin Knolls Fourth/Fifth Addition

Serves 90 peopleGroundwaterOwner: PrivateCedar Rapids, Iowa
Nothing open that measures the water, but 3 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 2012: 23 violations. 7 missed or late tests · 16 notices or reports. Most recent began 2025-05-24.

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
0Treatment lapse
7Missed or late test2 open
16Notice or report1 open

More violations on record than 95% of active water systems in Iowa. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

200520102012 · Notice or report: 22012 · Notice or report: 22013 · Notice or report: 32013 · Notice or report: 32013 · Notice or report: 32014 · Notice or report: 22014 · Notice or report: 220152016 · Notice or report: 12018 · Missed or late test: 120202021 · Missed or late test: 12021 · Notice or report: 22021 · Notice or report: 22022 · Missed or late test: 32022 · Missed or late test: 32022 · Missed or late test: 32022 · Notice or report: 42022 · Notice or report: 42022 · Notice or report: 42022 · Notice or report: 42023 · Notice or report: 12024 · Missed or late test: 12025 · Missed or late test: 12025 · Notice or report: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
30% missed or late test · 770% notice or report · 16

Across Iowa, 63% of violations are missed or late tests and 7% 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

10 ppb
3 ppb
1 ppb

Open now (3)

  1. 2025-05-24Public NoticePN Violation for NPDWR ViolationOpen
  2. 2024-12-01Lead and Copper RuleLead Consumer NoticeOpen
  3. 2018-12-01Lead and Copper RuleLead Consumer NoticeOpen

Every violation on record

  1. 2025-05-24Public NoticePN Violation for NPDWR ViolationOpen
  2. 2025-01-01Revised Total Coliform RuleMONBack in compliance
  3. 2024-12-01Lead and Copper RuleLead Consumer NoticeOpen
  4. 2023-05-13Public NoticePN Violation for NPDWR ViolationBack in compliance
  5. 2022-10-12Public NoticePN Violation for NPDWR ViolationBack in compliance
  6. 2022-08-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  7. 2022-08-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  8. 2022-07-13Public NoticePN Violation for NPDWR ViolationBack in compliance
  9. 2022-07-01SodiumMonitoring, RegularPeriod ended · no return to compliance on file
  10. 2022-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  11. 2022-04-01Unknown contaminantOperations ReportBack in compliance
  12. 2021-12-01Lead and Copper RuleLead Consumer NoticeBack in compliance
  13. 2021-09-01Unknown contaminantOperations ReportBack in compliance
  14. 2021-06-01Unknown contaminantOperations ReportBack in compliance
  15. 2018-12-01Lead and Copper RuleLead Consumer NoticeOpen
  16. 2016-06-01Unknown contaminantOperations ReportBack in compliance
  17. 2014-04-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  18. 2014-01-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  19. 2013-08-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  20. 2013-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  21. 2013-07-01Public NoticePN Violation for NPDWR ViolationBack in compliance
  22. 2012-07-26Public NoticePN Violation for NPDWR ViolationBack in compliance
  23. 2012-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance

System details

Population served90
Service connections36
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CityCedar Rapids
EPA ZIP on file52408

Areas served

  • Toddville, Linn County

Reading this record

Twin Knolls Fourth/Fifth Addition is a community water system that draws from groundwater and serves about 90 people in Cedar Rapids, Iowa. 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.