Eastin
Non-Transient non-community system in Stanislaus County, California, serving 26 people from ground water. 2 rules violated in the past three years. Privately owned.
Quarterly compliance history
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
2026
Rules violated in the past three years
Jul to Sep 2023 to Jul to Sep 2026
Inorganic Chemicals
Maximum Contaminant Level Violation
Health-based
2 violations, Jul 2023 to Nov 2025 · Mercury · 2 measured values
Inorganic Chemicals
Maximum Contaminant Level Violation Health-based2 violations, Jul 2023 to Nov 2025 · Mercury · 2 measured values
Maximum Contaminant Level Violation, health-based: 2 violations, Jul 2023 to Nov 2025. A sample exceeded the maximum contaminant level EPA allows in drinking water.
Limit 2 UG/L · Apr to Jun 2025
Limit 2 UG/L · Jul to Sep 2023
Contaminant on the record: Mercury.
Mercury, health effects: Chronic exposure to inorganic mercury in water primarily damages the kidneys. Neurological effects — tremors, memory loss, cognitive impairment — are more associated with organic mercury (methylmercury) than with the inorganic form regulated in drinking water. Developing fetuses and young children are most vulnerable. Limit: 0.002 mg/L (2 ppb)
Nitrate Rule
Maximum Contaminant Level Violation
Health-based
10 violations, Jul 2023 to Mar 2026 · 10 measured values
Nitrate Rule
Maximum Contaminant Level Violation Health-based10 violations, Jul 2023 to Mar 2026 · 10 measured values
Maximum Contaminant Level Violation, health-based: 10 violations, Jul 2023 to Mar 2026. A sample exceeded the maximum contaminant level EPA allows in drinking water.
Limit 10 MG/L · Jan to Mar 2026
Limit 10 MG/L · Oct to Dec 2025
Limit 10 MG/L · Jul to Sep 2025
Limit 10 MG/L · Jan to Mar 2025
Limit 10 MG/L · Oct to Dec 2024
Limit 10 MG/L · Jul to Sep 2024
4 more in EPA's record
What the rule requires: Nitrate (NO₃) is the most common chemical contaminant in US groundwater, entering from fertilizers, septic systems, and animal waste. It is odorless and tasteless — the only way to know if it's present is to test.
Health effects: Methemoglobinemia in infants under 6 months: gut bacteria convert nitrate to nitrite, which blocks oxygen transport in blood. Pregnant women should also take precautions. Chronic adult exposure at elevated levels may increase cancer risk. Limit: 10 mg/L as nitrogen (NO₃-N)
About this ruleLead 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.
Action level 0.015 mg/L · Jan 2022 to Dec 2024
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.
Service area from EPA's Public Water System Service Area Boundaries dataset: location confidence State Sourced. The system's location is the centre of the service area EPA publishes for the system.
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 California 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.