Transient Non-Community · PWSID AZ0412029

Sonoita Mercantile Water System

Serves 125 peopleGroundwaterOwner: Public/PrivateSonoita, Arizona
Nothing open right now.

On record since 2009: 19 violations. 3 over the limit · 2 treatment lapses · 4 missed or late tests · 10 notices or reports. Most recent began 2024-11-01.

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

3Over the limit
2Treatment lapse
4Missed or late test
10Notice or report

More violations on record than 62% of active water systems in Arizona. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

20052009 · Missed or late test: 1201020152019 · Notice or report: 12020 · Notice or report: 120202022 · Treatment lapse: 22022 · Treatment lapse: 22022 · Notice or report: 32022 · Notice or report: 32022 · Notice or report: 32023 · Missed or late test: 22023 · Missed or late test: 22023 · Notice or report: 12024 · Over the limit: 32024 · Over the limit: 32024 · Over the limit: 32024 · Missed or late test: 12024 · Notice or report: 42024 · Notice or report: 42024 · Notice or report: 42024 · Notice or report: 42025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
16% over the limit · 311% treatment lapse · 221% missed or late test · 453% notice or report · 10

Across Arizona, 65% of violations are missed or late tests and 5% are water over a limit.

How far over the limit

at the limit2×5×10×100×+Nitrate2024-07-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2024-04-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2024-01-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)
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.

Every violation on record

  1. 2024-11-01Revised Total Coliform RuleRPTBack in compliance
  2. 2024-08-24Public NoticePN Violation for NPDWR ViolationBack in compliance
  3. 2024-07-19Public NoticePN Violation for NPDWR ViolationBack in compliance
  4. 2024-07-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LBack in compliance
  5. 2024-04-14Public NoticePN Violation for NPDWR ViolationBack in compliance
  6. 2024-04-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LBack in compliance
  7. 2024-04-01NitrateMonitoring, RegularBack in compliance
  8. 2024-01-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  9. 2023-07-01NitrateMonitoring, RegularBack in compliance
  10. 2023-04-01NitrateMonitoring, RegularBack in compliance
  11. 2023-01-05Public NoticePN Violation for NPDWR ViolationBack in compliance
  12. 2022-12-01Revised Total Coliform RuleRPTBack in compliance
  13. 2022-10-31Public NoticePN Violation for NPDWR ViolationBack in compliance
  14. 2022-09-03Revised Total Coliform RuleTTBack in compliance
  15. 2022-07-25Revised Total Coliform RuleTTBack in compliance
  16. 2022-06-02Revised Total Coliform RuleOtherBack in compliance
  17. 2020-02-20Public NoticePN Violation for NPDWR ViolationBack in compliance
  18. 2019-06-01Revised Total Coliform RuleOtherBack in compliance
  19. 2009-01-01NitriteMonitoring, RegularBack in compliance

System details

Population served125
Service connections2
Water sourceGroundwater
System typeTransient Non-Community
OwnerPublic/Private
StatusActive
CitySonoita
EPA ZIP on file85637

Areas served

  • Sonoita, Santa Cruz County

Reading this record

Sonoita Mercantile Water System is a transient non-community that draws from groundwater and serves about 125 people in Sonoita, Arizona. 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.