Tapcensus

Northstar Subdivision

Community water system in Canyon County, Idaho, serving 50 people from ground water. 4 rules violated in the past three years. Privately owned.

People served 50 ground water
Rules violated, past 3 years 4 one rule can carry several violations
Unresolved 0 rules currently in violation, EPA data updated Oct 7, 2026
Quarters with violations 7 of the last 12 quarters

Quarterly compliance history

–Q3
2023
–Q4
2023
–Q1
2024
VQ2
2024
VQ3
2024
SQ4
2024
VQ1
2025
–Q2
2025
SQ3
2025
SQ4
2025
SQ1
2026
–Q2
2026
UQ3
2026
–No violation identified VViolation identified SSerious violator (EPA enforcement priority) UUndetermined Oldest quarter on the left. Quarters 1 to 12 are the twelve most recent official quarters at EPA's last data refresh; the 13th is the quarter in progress at that refresh, which EPA reports as undetermined.

Rules violated in the past three years

Jul to Sep 2023 to Jul to Sep 2026

Ground Water Rule

Treatment Technique Violation Health-based

1 violation, May 2024 to Sep 2024
EPA rule code 140 · 1 violation recorded, 1 health-based

Treatment Technique Violation, health-based: 1 violation, May 2024 to Sep 2024. The system did not carry out a required treatment process or corrective action.

What the rule requires: The 2006 GWR requires regular sanitary surveys of groundwater systems and targeted corrective action when fecal indicators are found in source water. Systems with significant deficiencies must provide 4-log virus treatment (99.99% removal/inactivation) or fix the deficiency.

Health effects: Protects against enteric viruses, which can contaminate groundwater via cracked well casings, failing septic systems, or animal waste. Viruses persist longer in groundwater than in surface water. Hepatitis A and norovirus are the primary pathogens of concern. Limit: Treatment technique: 4-log virus treatment required when source water has fecal indicators or significant sanitary deficiencies

About this rule

Radionuclides and Revised Rad Rule

Maximum Contaminant Level Violation Health-based

2 violations, Oct 2024 to Jun 2026 · Gross Alpha, Excl. Radon and U · 2 measured values
EPA rule code 340 · 2 violations recorded, 2 health-based

Maximum Contaminant Level Violation, health-based: 2 violations, Oct 2024 to Jun 2026. A sample exceeded the maximum contaminant level EPA allows in drinking water.

Measured
Gross Alpha, Excl. Radon and U 17 PCI/L

Limit 15 PCI/L · Jan to Mar 2025

Gross Alpha, Excl. Radon and U 18 PCI/L

Limit 15 PCI/L · Oct to Dec 2024

Contaminant on the record: Gross Alpha, Excl. Radon and U.

Gross Alpha, Excl. Radon and U, health effects: Alpha-emitting radionuclides accumulate in bone and soft tissue, delivering sustained internal radiation doses that increase lifetime cancer risk. There is no established safe threshold for ionizing radiation. Individual contributors such as radium-226 and polonium-210 have their own MCLs; gross alpha serves as a cost-effective screening tool that triggers more specific radionuclide analysis when exceeded. Limit: 15 pCi/L (excluding radon and uranium)

Lead and Copper Rule Revisions

Reporting ViolationTreatment Technique Violation Health-based

2 violations, Oct 2024 to Jan 2025
EPA rule code 351 · 2 violations recorded, 1 health-based

Treatment Technique Violation, health-based: 1 violation, Oct 2024 to Jan 2025. The system did not carry out a required treatment process or corrective action.

Reporting Violation: 1 violation, Oct 2024 to Jan 2025. The system did not report required information on time.

What the rule requires: The 2021 LCRR updated the 1991 LCR with mandatory lead service line inventories and replacement planning, a new 'trigger level' at 10 ppb requiring optimization, and strengthened public education. The 2024 Lead and Copper Rule Improvements (LCRI) further requires replacing all lead service lines within 10 years.

Health effects: Same as Lead and Copper Rule (5000). Violations typically reflect failure to complete the required lead service line inventory or submit a required replacement plan. Lead service lines are the primary source of lead at the tap in many older systems. Limit: Lead action level: 15 ppb (trigger level: 10 ppb); copper action level: 1.3 mg/L

About this rule

Public Notice Rule and Revised PN Rule

Other Violation

2 violations, Jul 2024 to Mar 2025 · Public Notification Rule
EPA rule code 410 · 2 violations recorded

Other Violation: 2 violations, Jul 2024 to Mar 2025. A requirement other than monitoring, reporting, or a contaminant limit, such as public notice or the annual water quality report.

Contaminant on the record: Public Notification Rule.

Lead and copper at the tap

The 90th percentile of the tap samples the system collected in its latest monitoring period, against EPA's action level. Levels vary between homes.

Lead 0.003 mg/L

Action level 0.015 mg/L · Jan to Dec 2025

About this data

Rules violated and the list above come from EPA's SDWIS violation records, one row per violation and contaminant, grouped by the rule each row belongs to. A violation counts when its non-compliance period ended on or after Jul 1, 2023, the start of the thirteen quarters ECHO's three-year figures cover, or is still open; it is unresolved when it was still open at EPA's data refresh on Oct 7, 2026. EPA's rule code 500, "Not Regulated", is left out, as in ECHO's counts. Each rule's violation count is EPA's, and one rule can carry several: a missed monitoring round for a group of contaminants is one violation per contaminant and period. Category names are EPA's violation categories.

ECHO's own summary count of rules violated agrees with this grouping for 98.8% of active systems nationally, and its count of rules being violated for 98.7%; where they differ, the figures here follow the rows listed.

A measured value shown with a rule is the sample result EPA recorded with that violation (SDWIS viol_measure), against the limit EPA recorded on the same row (state_mcl), both in EPA's unit as written; violations without a recorded value, such as missed monitoring, show none. Other measured contaminant levels are not part of this record; each system publishes them in its annual Consumer Confidence Report.

Lead and copper are the newest 90th-percentile results in EPA's SDWA data download (LCR_SAMPLES, codes PB90 and CU90): for each monitoring period a system reports the 90th-percentile value of its tap samples, which EPA compares with its action level of 0.015 mg/L for lead and 1.3 mg/L for copper (40 CFR 141.80). A result is not a measurement of any one tap.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Idaho records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.