Community Water System · PWSID CO0107487

Louisville City of

Serves 20,975 peopleSurface WaterOwner: Local GovernmentLouisville, Colorado
Nothing open right now.

On record since 2017: 26 violations. 2 treatment lapses · 23 missed or late tests · 1 notice or report. Most recent began 2024-10-17.

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
2Treatment lapse
23Missed or late test
1Notice or report

More violations on record than 85% of active water systems in Colorado. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

2005201020152017 · Missed or late test: 222017 · Missed or late test: 222017 · Missed or late test: 222017 · Missed or late test: 222017 · Missed or late test: 222017 · Missed or late test: 222017 · Missed or late test: 222017 · Missed or late test: 222017 · Missed or late test: 222017 · Missed or late test: 222017 · Missed or late test: 222018 · Missed or late test: 120202021 · Treatment lapse: 22024 · Notice or report: 12025
One square ≈ 2 violations (rounded up), by the year they began. Empty columns are years with nothing on EPA's record.
8% treatment lapse · 288% missed or late test · 234% notice or report · 1

Across Colorado, 74% of violations are missed or late tests and 6% 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 13 results on file · action level 15 ppb

2 ppb
1.6 ppb
1.4 ppb
1.3 ppb
1.1 ppb
1.1 ppb
0.8 ppb
0.6 ppb
0 ppb
0 ppb
0 ppb
0 ppb
0 ppb

Every violation on record

  1. 2024-10-17Lead service line inventoryRPTBack in compliance
  2. 2021-12-01Surface water treatment (SWTR)Treatment Technique (SWTR and GWR)Back in compliance
  3. 2021-12-01Surface water filtration (IESWTR)Single Turbidity Exceed (Enhanced SWTR)Back in compliance
  4. 2018-04-01E. ColiMonitoring, Source Water (LT2)Back in compliance
  5. 2017-07-01E. ColiMonitoring, Source Water (LT2)Back in compliance
  6. 2017-01-01StyreneMonitoring, RegularBack in compliance
  7. 2017-01-01EthylbenzeneMonitoring, RegularBack in compliance
  8. 2017-01-01TolueneMonitoring, RegularBack in compliance
  9. 2017-01-01BenzeneMonitoring, RegularBack in compliance
  10. 2017-01-01ChlorobenzeneMonitoring, RegularBack in compliance
  11. 2017-01-01TetrachloroethyleneMonitoring, RegularBack in compliance
  12. 2017-01-011,1,2-TrichloroethaneMonitoring, RegularBack in compliance
  13. 2017-01-01TrichloroethyleneMonitoring, RegularBack in compliance
  14. 2017-01-011,2-DichloropropaneMonitoring, RegularBack in compliance
  15. 2017-01-01Carbon tetrachlorideMonitoring, RegularBack in compliance
  16. 2017-01-011,1,1-TrichloroethaneMonitoring, RegularBack in compliance
  17. 2017-01-011,2-DichloroethaneMonitoring, RegularBack in compliance
  18. 2017-01-01trans-1,2-DichloroethyleneMonitoring, RegularBack in compliance
  19. 2017-01-011,1-DichloroethyleneMonitoring, RegularBack in compliance
  20. 2017-01-01Vinyl chlorideMonitoring, RegularBack in compliance
  21. 2017-01-01p-DichlorobenzeneMonitoring, RegularBack in compliance
  22. 2017-01-01o-DichlorobenzeneMonitoring, RegularBack in compliance
  23. 2017-01-01DichloromethaneMonitoring, RegularBack in compliance
  24. 2017-01-01Xylenes, TotalMonitoring, RegularBack in compliance
  25. 2017-01-01cis-1,2-DichloroethyleneMonitoring, RegularBack in compliance
Show the other 1 entries
  1. 2017-01-011,2,4-TrichlorobenzeneMonitoring, RegularBack in compliance

System details

Population served20,975
Service connections7,368
Water sourceSurface Water
System typeCommunity Water System
OwnerLocal Government
StatusActive
CityLouisville
EPA ZIP on file80027

Areas served

  • Boulder County

Reading this record

Louisville City of is a community water system that draws from surface water and serves about 20,975 people in Louisville, Colorado. 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.