Community Water System · PWSID VA2109510

Louisa County Water Authority

Serves 4,254 peopleSurface WaterOwner: Local GovernmentLouisa, Virginia
Nothing open right now.

On record since 2014: 22 violations. 22 over the limit. 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.

22Over the limit
0Treatment lapse
0Missed or late test
0Notice or report

More violations on record than 93% of active water systems in Virginia. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

200520102014 · Over the limit: 42014 · Over the limit: 42014 · Over the limit: 42014 · Over the limit: 42015 · 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: 820152016 · Over the limit: 52016 · Over the limit: 52016 · Over the limit: 52016 · Over the limit: 52016 · Over the limit: 52017 · Over the limit: 32017 · Over the limit: 32017 · Over the limit: 320202025 · Over the limit: 22025 · Over the limit: 22025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
100% over the limit · 22

Across Virginia, 74% of violations are missed or late tests and 7% are water over a limit.

How far over the limit

at the limit2×5×10×100×+Total Haloacetic Acids (HAA5)Trihalomethanes (TTHM)2025-07-01 · Total Haloacetic Acids (HAA5): measured 66.00 UG/L vs limit 60.00 UG/L (1.1×)2025-07-01 · Trihalomethanes (TTHM): measured 84.00 UG/L vs limit 80.00 UG/L (1.1×)2017-07-01 · Total Haloacetic Acids (HAA5): measured 0.0620 MG/L vs limit 0.0600 MG/L (1.0×)2017-04-01 · Total Haloacetic Acids (HAA5): measured 92.00 UG/L vs limit 60.00 UG/L (1.5×)2017-01-01 · Total Haloacetic Acids (HAA5): measured 0.0990 MG/L vs limit 0.0600 MG/L (1.7×)2016-10-01 · Total Haloacetic Acids (HAA5): measured 0.0980 MG/L vs limit 0.0600 MG/L (1.6×)2016-07-01 · Total Haloacetic Acids (HAA5): measured 0.0830 MG/L vs limit 0.0600 MG/L (1.4×)2016-04-01 · Total Haloacetic Acids (HAA5): measured 0.0700 MG/L vs limit 0.0600 MG/L (1.2×)2016-01-01 · Total Haloacetic Acids (HAA5): measured 0.0630 MG/L vs limit 0.0600 MG/L (1.1×)2016-01-01 · Trihalomethanes (TTHM): measured 0.0820 MG/L vs limit 0.0800 MG/L (1.0×)2015-10-01 · Total Haloacetic Acids (HAA5): measured 0.0800 MG/L vs limit 0.0600 MG/L (1.3×)2015-10-01 · Trihalomethanes (TTHM): measured 0.0920 MG/L vs limit 0.0800 MG/L (1.1×)2015-07-01 · Trihalomethanes (TTHM): measured 0.0850 MG/L vs limit 0.0800 MG/L (1.1×)2015-07-01 · Total Haloacetic Acids (HAA5): measured 0.0720 MG/L vs limit 0.0600 MG/L (1.2×)2015-04-01 · Total Haloacetic Acids (HAA5): measured 0.0750 MG/L vs limit 0.0600 MG/L (1.2×)2015-04-01 · Trihalomethanes (TTHM): measured 0.0810 MG/L vs limit 0.0800 MG/L (1.0×)2015-01-01 · Total Haloacetic Acids (HAA5): measured 0.0670 MG/L vs limit 0.0600 MG/L (1.1×)2015-01-01 · Trihalomethanes (TTHM): measured 0.0880 MG/L vs limit 0.0800 MG/L (1.1×)2014-10-01 · Trihalomethanes (TTHM): measured 0.0920 MG/L vs limit 0.0800 MG/L (1.1×)2014-10-01 · Total Haloacetic Acids (HAA5): measured 0.0670 MG/L vs limit 0.0600 MG/L (1.1×)2014-07-01 · Total Haloacetic Acids (HAA5): measured 68.00 UG/L vs limit 60.00 UG/L (1.1×)2014-07-01 · Trihalomethanes (TTHM): measured 95.00 UG/L vs limit 80.00 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 4 results on file · action level 15 ppb

0 ppb
0 ppb
0 ppb
0 ppb

Every violation on record

  1. 2025-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 66.00 UG/L · limit 60.00 UG/LPeriod ended · no return to compliance on file
  2. 2025-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 84.00 UG/L · limit 80.00 UG/LPeriod ended · no return to compliance on file
  3. 2017-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0620 MG/L · limit 0.0600 MG/LBack in compliance
  4. 2017-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 92.00 UG/L · limit 60.00 UG/LBack in compliance
  5. 2017-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0990 MG/L · limit 0.0600 MG/LBack in compliance
  6. 2016-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0980 MG/L · limit 0.0600 MG/LBack in compliance
  7. 2016-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0830 MG/L · limit 0.0600 MG/LBack in compliance
  8. 2016-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0700 MG/L · limit 0.0600 MG/LBack in compliance
  9. 2016-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0630 MG/L · limit 0.0600 MG/LBack in compliance
  10. 2016-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0820 MG/L · limit 0.0800 MG/LBack in compliance
  11. 2015-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0800 MG/L · limit 0.0600 MG/LBack in compliance
  12. 2015-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0920 MG/L · limit 0.0800 MG/LBack in compliance
  13. 2015-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0850 MG/L · limit 0.0800 MG/LBack in compliance
  14. 2015-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0720 MG/L · limit 0.0600 MG/LBack in compliance
  15. 2015-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0750 MG/L · limit 0.0600 MG/LBack in compliance
  16. 2015-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0810 MG/L · limit 0.0800 MG/LBack in compliance
  17. 2015-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0670 MG/L · limit 0.0600 MG/LBack in compliance
  18. 2015-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0880 MG/L · limit 0.0800 MG/LBack in compliance
  19. 2014-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0920 MG/L · limit 0.0800 MG/LBack in compliance
  20. 2014-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0670 MG/L · limit 0.0600 MG/LBack in compliance
  21. 2014-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 68.00 UG/L · limit 60.00 UG/LBack in compliance
  22. 2014-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 95.00 UG/L · limit 80.00 UG/LBack in compliance

System details

Population served4,254
Service connections185
Water sourceSurface Water
System typeCommunity Water System
OwnerLocal Government
StatusActive
CityLouisa
EPA ZIP on file23093

Areas served

  • Louisa County

Reading this record

Louisa County Water Authority is a community water system that draws from surface water and serves about 4,254 people in Louisa, Virginia. 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.