Community Water System · PWSID NC4092073

Rockbridge S/D

Serves 1,042 peopleGroundwaterOwner: PrivateChapel Hill, North Carolina
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 2008: 39 violations. 12 over the limit · 1 treatment lapse · 17 missed or late tests · 9 notices or reports. Most recent began 2025-07-01.

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

12Over the limit
1Treatment lapse
17Missed or late test
9Notice or report3 open

More violations on record than 96% of active water systems in North Carolina. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

20052008 · Missed or late test: 120102015 · Over the limit: 82015 · Over the limit: 82015 · Over the limit: 82015 · Over the limit: 82015 · Over the limit: 82015 · Over the limit: 82015 · Over the limit: 82015 · Over the limit: 82015 · Notice or report: 22015 · Notice or report: 220152016 · Over the limit: 42016 · Over the limit: 42016 · Over the limit: 42016 · Over the limit: 42016 · Notice or report: 32016 · Notice or report: 32016 · Notice or report: 320202021 · Missed or late test: 22021 · Missed or late test: 22023 · Notice or report: 12024 · Treatment lapse: 12024 · Missed or late test: 62024 · Missed or late test: 62024 · Missed or late test: 62024 · Missed or late test: 62024 · Missed or late test: 62024 · Missed or late test: 62024 · Notice or report: 22024 · Notice or report: 22025 · Missed or late test: 82025 · Missed or late test: 82025 · Missed or late test: 82025 · Missed or late test: 82025 · Missed or late test: 82025 · Missed or late test: 82025 · Missed or late test: 82025 · Missed or late test: 82025 · Notice or report: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
31% over the limit · 123% treatment lapse · 144% missed or late test · 1723% notice or report · 9

Across North Carolina, 39% of violations are missed or late tests and 2% are water over a limit.

How far over the limit

at the limit2×5×10×100×+Combined UraniumGross Alpha, Excl. Radon and U2016-10-01 · Combined Uranium: measured 42.10 PCI/L vs limit 20.10 PCI/L (2.1×)2016-07-01 · Combined Uranium: measured 46.10 PCI/L vs limit 20.10 PCI/L (2.3×)2016-04-01 · Combined Uranium: measured 77.10 PCI/L vs limit 20.10 PCI/L (3.8×)2016-01-01 · Combined Uranium: measured 60.40 PCI/L vs limit 20.10 PCI/L (3.0×)2015-10-01 · Combined Uranium: measured 81.10 PCI/L vs limit 20.10 PCI/L (4.0×)2015-10-01 · Gross Alpha, Excl. Radon and U: measured 41.30 PCI/L vs limit 15.00 PCI/L (2.8×)2015-07-01 · Combined Uranium: measured 83.00 PCI/L vs limit 20.10 PCI/L (4.1×)2015-07-01 · Gross Alpha, Excl. Radon and U: measured 28.00 PCI/L vs limit 15.00 PCI/L (1.9×)2015-04-01 · Combined Uranium: measured 55.00 PCI/L vs limit 20.10 PCI/L (2.7×)2015-04-01 · Gross Alpha, Excl. Radon and U: measured 29.00 PCI/L vs limit 15.00 PCI/L (1.9×)2015-01-01 · Combined Uranium: measured 71.00 PCI/L vs limit 20.10 PCI/L (3.5×)2015-01-01 · Gross Alpha, Excl. Radon and U: measured 29.00 PCI/L vs limit 15.00 PCI/L (1.9×)
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 3 results on file · action level 15 ppb

4 ppb
4 ppb
3 ppb

Open now (3)

  1. 2025-07-01Consumer Confidence RuleCCR Complete Failure to ReportOpen
  2. 2024-07-01Consumer Confidence RuleCCR Complete Failure to ReportOpen
  3. 2015-09-05Public NoticePN Violation for NPDWR ViolationOpen

Every violation on record

  1. 2025-07-01Consumer Confidence RuleCCR Complete Failure to ReportOpen
  2. 2025-03-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  3. 2025-03-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  4. 2025-02-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  5. 2025-02-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  6. 2025-01-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  7. 2025-01-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  8. 2025-01-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  9. 2025-01-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  10. 2024-10-17Lead service line inventoryRPTBack in compliance
  11. 2024-10-17Lead service line inventoryTTBack in compliance
  12. 2024-07-01Consumer Confidence RuleCCR Complete Failure to ReportOpen
  13. 2024-01-01Radium-228Monitoring, RegularPeriod ended · no return to compliance on file
  14. 2024-01-01Radium-226Monitoring, RegularPeriod ended · no return to compliance on file
  15. 2024-01-01Combined Radium (-226 and -228)Monitoring, RegularPeriod ended · no return to compliance on file
  16. 2024-01-01Combined UraniumMonitoring, RegularPeriod ended · no return to compliance on file
  17. 2024-01-01Gross Alpha, Excl. Radon and UMonitoring, RegularPeriod ended · no return to compliance on file
  18. 2024-01-01Lead and Copper RuleLead Consumer NoticeBack in compliance
  19. 2023-07-11Revised Total Coliform RuleRPTBack in compliance
  20. 2021-08-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  21. 2021-08-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  22. 2016-10-01Combined UraniumMCL, Averagemeasured 42.10 PCI/L · limit 20.10 PCI/LBack in compliance
  23. 2016-09-18Public NoticePN Violation for NPDWR ViolationBack in compliance
  24. 2016-07-01Combined UraniumMCL, Averagemeasured 46.10 PCI/L · limit 20.10 PCI/LBack in compliance
  25. 2016-04-01Combined UraniumMCL, Averagemeasured 77.10 PCI/L · limit 20.10 PCI/LBack in compliance
Show the other 13 entries
  1. 2016-02-27Public Notice ×2PN Violation for NPDWR ViolationBack in compliance
  2. 2016-01-01Combined UraniumMCL, Averagemeasured 60.40 PCI/L · limit 20.10 PCI/LBack in compliance
  3. 2015-10-01Combined UraniumMCL, Averagemeasured 81.10 PCI/L · limit 20.10 PCI/LBack in compliance
  4. 2015-10-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 41.30 PCI/L · limit 15.00 PCI/LBack in compliance
  5. 2015-09-05Public NoticePN Violation for NPDWR ViolationOpen
  6. 2015-09-05Public NoticePN Violation for NPDWR ViolationBack in compliance
  7. 2015-07-01Combined UraniumMCL, Averagemeasured 83.00 PCI/L · limit 20.10 PCI/LBack in compliance
  8. 2015-07-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 28.00 PCI/L · limit 15.00 PCI/LBack in compliance
  9. 2015-04-01Combined UraniumMCL, Averagemeasured 55.00 PCI/L · limit 20.10 PCI/LBack in compliance
  10. 2015-04-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 29.00 PCI/L · limit 15.00 PCI/LBack in compliance
  11. 2015-01-01Combined UraniumMCL, Averagemeasured 71.00 PCI/L · limit 20.10 PCI/LBack in compliance
  12. 2015-01-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 29.00 PCI/L · limit 15.00 PCI/LBack in compliance
  13. 2008-01-01Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance

System details

Population served1,042
Service connections410
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CityChapel Hill
EPA ZIP on file27713

Areas served

  • Knightdale, Wake County

Reading this record

Rockbridge S/D is a community water system that draws from groundwater and serves about 1,042 people in Chapel Hill, North Carolina. 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.